21556607908080 has 160 divisors (see below), whose sum is σ = 76373691913728. Its totient is φ = 4927114368000.

The previous prime is 21556607908051. The next prime is 21556607908081. The reversal of 21556607908080 is 8080970665512.

It is a self number, because there is not a number n which added to its sum of digits gives 21556607908080.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21556607908081) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 92840130 + ... + 93072030.

Almost surely, 2^{21556607908080} is an apocalyptic number.

21556607908080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21556607908080 is an abundant number, since it is smaller than the sum of its proper divisors (54817084005648).

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

21556607908080 is a wasteful number, since it uses less digits than its factorization.

21556607908080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287255 (or 287249 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 57.

The spelling of 21556607908080 in words is "twenty-one trillion, five hundred fifty-six billion, six hundred seven million, nine hundred eight thousand, eighty".