21020845756320 has 288 divisors, whose sum is σ = 71853525080064. Its totient is φ = 5596198502400.

The previous prime is 21020845756307. The next prime is 21020845756363. The reversal of 21020845756320 is 2365754802012.

21020845756320 is a `hidden beast` number, since 2 + 1 + 0 + 2 + 0 + 8 + 4 + 5 + 7 + 5 + 632 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2669987904 + ... + 2669995776.

It is an arithmetic number, because the mean of its divisors is an integer number (249491406528).

Almost surely, 2^{21020845756320} is an apocalyptic number.

21020845756320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21020845756320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35926762540032).

21020845756320 is an abundant number, since it is smaller than the sum of its proper divisors (50832679323744).

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

21020845756320 is a wasteful number, since it uses less digits than its factorization.

21020845756320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10756 (or 10745 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 45.

The spelling of 21020845756320 in words is "twenty-one trillion, twenty billion, eight hundred forty-five million, seven hundred fifty-six thousand, three hundred twenty".