21153135204 has 48 divisors (see below), whose sum is σ = 55076898240. Its totient is φ = 7020774720.

The previous prime is 21153135203. The next prime is 21153135217. The reversal of 21153135204 is 40253135112.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21153135203) 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, 395142 + ... + 445469.

It is an arithmetic number, because the mean of its divisors is an integer number (1147435380).

Almost surely, 2^21153135204 is an apocalyptic number.

It is an amenable number.

21153135204 is an abundant number, since it is smaller than the sum of its proper divisors (33923763036).

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

21153135204 is a wasteful number, since it uses less digits than its factorization.

21153135204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840857 (or 840849 counting only the distinct ones).

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

The spelling of 21153135204 in words is "twenty-one billion, one hundred fifty-three million, one hundred thirty-five thousand, two hundred four".