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21256030426212 = 223322736710332287
BaseRepresentation
bin1001101010101000011100…
…01001001001010001100100
32210021001112022022011212000
410311110032021021101210
510241224322242114322
6113112515141125300
74322461151341131
oct465241611112144
983231468264760
1021256030426212
1168556a503969a
1224736896b9830
13bb2586acb19a
14536b23d65588
1526cdb8a5e3ac
hex13550e249464

21256030426212 has 192 divisors, whose sum is σ = 55579835351040. Its totient is φ = 7025026205952.

The previous prime is 21256030426171. The next prime is 21256030426219. The reversal of 21256030426212 is 21262403065212.

21256030426212 is a `hidden beast` number, since 2 + 1 + 2 + 5 + 603 + 0 + 4 + 26 + 21 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21256030426219) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9294284133 + ... + 9294286419.

It is an arithmetic number, because the mean of its divisors is an integer number (289478309120).

Almost surely, 221256030426212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21256030426212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27789917675520).

21256030426212 is an abundant number, since it is smaller than the sum of its proper divisors (34323804924828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21256030426212 is a wasteful number, since it uses less digits than its factorization.

21256030426212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3927 (or 3919 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 21256030426212 in words is "twenty-one trillion, two hundred fifty-six billion, thirty million, four hundred twenty-six thousand, two hundred twelve".