21354782652 has 72 divisors (see below), whose sum is σ = 63976488576. Its totient is φ = 6101364528.

The previous prime is 21354782641. The next prime is 21354782681. The reversal of 21354782652 is 25628745312.

21354782652 is a `hidden beast` number, since 21 + 3 + 547 + 82 + 6 + 5 + 2 = 666.

It is a super-2 number, since 2×21354782652² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21354782598 and 21354782607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1562478 + ... + 1576085.

Almost surely, 2^21354782652 is an apocalyptic number.

It is an amenable number.

21354782652 is an abundant number, since it is smaller than the sum of its proper divisors (42621705924).

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

21354782652 is a wasteful number, since it uses less digits than its factorization.

21354782652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3138589 (or 3138575 counting only the distinct ones).

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

The spelling of 21354782652 in words is "twenty-one billion, three hundred fifty-four million, seven hundred eighty-two thousand, six hundred fifty-two".