21012033210 has 32 divisors (see below), whose sum is σ = 57633005952. Its totient is φ = 4802750400.

The previous prime is 21012033209. The next prime is 21012033247. The reversal of 21012033210 is 1233021012.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21012033210.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50028441 + ... + 50028860.

It is an arithmetic number, because the mean of its divisors is an integer number (1801031436).

Almost surely, 2^21012033210 is an apocalyptic number.

21012033210 is an abundant number, since it is smaller than the sum of its proper divisors (36620972742).

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

21012033210 is a wasteful number, since it uses less digits than its factorization.

21012033210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100057318.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21012033210 its reverse (1233021012), we get a palindrome (22245054222).

The spelling of 21012033210 in words is "twenty-one billion, twelve million, thirty-three thousand, two hundred ten".