21563012502 has 12 divisors (see below), whose sum is σ = 46719860460. Its totient is φ = 7187670828.

The previous prime is 21563012489. The next prime is 21563012507. The reversal of 21563012502 is 20521036512.

It is a happy number.

21563012502 is a `hidden beast` number, since 2 + 1 + 5 + 630 + 1 + 25 + 0 + 2 = 666.

It is a super-2 number, since 2×21563012502² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21563012507) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 598972552 + ... + 598972587.

It is an arithmetic number, because the mean of its divisors is an integer number (3893321705).

Almost surely, 2^21563012502 is an apocalyptic number.

21563012502 is an abundant number, since it is smaller than the sum of its proper divisors (25156847958).

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

21563012502 is a wasteful number, since it uses less digits than its factorization.

21563012502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1197945147 (or 1197945144 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The spelling of 21563012502 in words is "twenty-one billion, five hundred sixty-three million, twelve thousand, five hundred two".