21255456060 has 144 divisors (see below), whose sum is σ = 65512504512. Its totient is φ = 5577600000.

The previous prime is 21255456059. The next prime is 21255456083. The reversal of 21255456060 is 6065455212.

21255456060 is a `hidden beast` number, since 2 + 1 + 2 + 5 + 5 + 45 + 606 + 0 = 666.

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

It is a congruent number.

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, 3032560 + ... + 3039560.

It is an arithmetic number, because the mean of its divisors is an integer number (454947948).

Almost surely, 2^21255456060 is an apocalyptic number.

21255456060 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 21255456060, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32756252256).

21255456060 is an abundant number, since it is smaller than the sum of its proper divisors (44257048452).

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

21255456060 is a wasteful number, since it uses less digits than its factorization.

21255456060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7284 (or 7279 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The spelling of 21255456060 in words is "twenty-one billion, two hundred fifty-five million, four hundred fifty-six thousand, sixty".