21170513120 has 96 divisors (see below), whose sum is σ = 50318029440. Its totient is φ = 8417157120.

The previous prime is 21170513113. The next prime is 21170513129. The reversal of 21170513120 is 2131507112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21170513129) 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, 29859326 + ... + 29860034.

It is an arithmetic number, because the mean of its divisors is an integer number (524146140).

Almost surely, 2^21170513120 is an apocalyptic number.

21170513120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21170513120 is an abundant number, since it is smaller than the sum of its proper divisors (29147516320).

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

21170513120 is a wasteful number, since it uses less digits than its factorization.

21170513120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1588 (or 1580 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 23.

The spelling of 21170513120 in words is "twenty-one billion, one hundred seventy million, five hundred thirteen thousand, one hundred twenty".