21515333010 has 16 divisors (see below), whose sum is σ = 51636799296. Its totient is φ = 5737422128.

The previous prime is 21515333009. The next prime is 21515333011. The reversal of 21515333010 is 1033351512.

It is an interprime number because it is at equal distance from previous prime (21515333009) and next prime (21515333011).

It is not an unprimeable number, because it can be changed into a prime (21515333011) 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, 358588854 + ... + 358588913.

It is an arithmetic number, because the mean of its divisors is an integer number (3227299956).

Almost surely, 2^21515333010 is an apocalyptic number.

21515333010 is an abundant number, since it is smaller than the sum of its proper divisors (30121466286).

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

21515333010 is a wasteful number, since it uses less digits than its factorization.

21515333010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717177777.

The product of its (nonzero) digits is 1350, while the sum is 24.

Adding to 21515333010 its reverse (1033351512), we get a palindrome (22548684522).

The spelling of 21515333010 in words is "twenty-one billion, five hundred fifteen million, three hundred thirty-three thousand, ten".