21237910530 has 16 divisors (see below), whose sum is σ = 50970985344. Its totient is φ = 5663442800.

The previous prime is 21237910523. The next prime is 21237910531. The reversal of 21237910530 is 3501973212.

It is a junction number, because it is equal to n+sod(n) for n = 21237910491 and 21237910500.

It is not an unprimeable number, because it can be changed into a prime (21237910531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353965146 + ... + 353965205.

It is an arithmetic number, because the mean of its divisors is an integer number (3185686584).

Almost surely, 2^21237910530 is an apocalyptic number.

21237910530 is an abundant number, since it is smaller than the sum of its proper divisors (29733074814).

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

21237910530 is a wasteful number, since it uses less digits than its factorization.

21237910530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707930361.

The product of its (nonzero) digits is 11340, while the sum is 33.

The spelling of 21237910530 in words is "twenty-one billion, two hundred thirty-seven million, nine hundred ten thousand, five hundred thirty".