21555527652 has 24 divisors (see below), whose sum is σ = 55884701600. Its totient is φ = 7185175848.

The previous prime is 21555527641. The next prime is 21555527659. The reversal of 21555527652 is 25672555512.

21555527652 is a `hidden beast` number, since 2 + 15 + 55 + 527 + 65 + 2 = 666.

It is a super-2 number, since 2×21555527652² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21555527598 and 21555527607.

It is not an unprimeable number, because it can be changed into a prime (21555527659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99794002 + ... + 99794217.

Almost surely, 2^21555527652 is an apocalyptic number.

It is an amenable number.

21555527652 is an abundant number, since it is smaller than the sum of its proper divisors (34329173948).

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

21555527652 is a wasteful number, since it uses less digits than its factorization.

21555527652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199588232 (or 199588224 counting only the distinct ones).

The product of its digits is 1050000, while the sum is 45.

The spelling of 21555527652 in words is "twenty-one billion, five hundred fifty-five million, five hundred twenty-seven thousand, six hundred fifty-two".