21007730532 has 48 divisors (see below), whose sum is σ = 52108862400. Its totient is φ = 6568329600.

The previous prime is 21007730519. The next prime is 21007730533. The reversal of 21007730532 is 23503770012.

It is a self number, because there is not a number n which added to its sum of digits gives 21007730532.

It is not an unprimeable number, because it can be changed into a prime (21007730533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 433107 + ... + 479162.

It is an arithmetic number, because the mean of its divisors is an integer number (1085601300).

Almost surely, 2^21007730532 is an apocalyptic number.

It is an amenable number.

21007730532 is an abundant number, since it is smaller than the sum of its proper divisors (31101131868).

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

21007730532 is a wasteful number, since it uses less digits than its factorization.

21007730532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 912396 (or 912394 counting only the distinct ones).

The product of its (nonzero) digits is 8820, while the sum is 30.

The spelling of 21007730532 in words is "twenty-one billion, seven million, seven hundred thirty thousand, five hundred thirty-two".