21234703536 has 60 divisors (see below), whose sum is σ = 62923430232. Its totient is φ = 6661867008.

The previous prime is 21234703513. The next prime is 21234703537. The reversal of 21234703536 is 63530743212.

21234703536 is a `hidden beast` number, since 2 + 1 + 234 + 70 + 353 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21234703536.

It is not an unprimeable number, because it can be changed into a prime (21234703537) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4334706 + ... + 4339601.

Almost surely, 2^21234703536 is an apocalyptic number.

It is an amenable number.

21234703536 is an abundant number, since it is smaller than the sum of its proper divisors (41688726696).

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

21234703536 is a wasteful number, since it uses less digits than its factorization.

21234703536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8674338 (or 8674329 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 36.

The spelling of 21234703536 in words is "twenty-one billion, two hundred thirty-four million, seven hundred three thousand, five hundred thirty-six".