21555054192 has 40 divisors (see below), whose sum is σ = 63638732416. Its totient is φ = 6158586816.

The previous prime is 21555054179. The next prime is 21555054229. The reversal of 21555054192 is 29145055512.

It is a super-2 number, since 2×21555054192² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21555054192.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32075638 + ... + 32076309.

Almost surely, 2^21555054192 is an apocalyptic number.

It is an amenable number.

21555054192 is an abundant number, since it is smaller than the sum of its proper divisors (42083678224).

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

21555054192 is a wasteful number, since it uses less digits than its factorization.

21555054192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64151965 (or 64151959 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 39.

The spelling of 21555054192 in words is "twenty-one billion, five hundred fifty-five million, fifty-four thousand, one hundred ninety-two".