21151512010 has 16 divisors (see below), whose sum is σ = 38230704072. Its totient is φ = 8425497600.

The previous prime is 21151511999. The next prime is 21151512023. The reversal of 21151512010 is 1021515112.

21151512010 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 13200401449 + 7951110561 = 114893^2 + 89169^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4385871 + ... + 4390690.

Almost surely, 2^21151512010 is an apocalyptic number.

21151512010 is a deficient number, since it is larger than the sum of its proper divisors (17079192062).

21151512010 is a wasteful number, since it uses less digits than its factorization.

21151512010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8776809.

The product of its (nonzero) digits is 100, while the sum is 19.

The spelling of 21151512010 in words is "twenty-one billion, one hundred fifty-one million, five hundred twelve thousand, ten".