21170661016152 has 64 divisors (see below), whose sum is σ = 54400364282880. Its totient is φ = 6861863981952.

The previous prime is 21170661016129. The next prime is 21170661016159. The reversal of 21170661016152 is 25161016607112.

It is a self number, because there is not a number n which added to its sum of digits gives 21170661016152.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21170661016159) 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, 45765843 + ... + 46226114.

It is an arithmetic number, because the mean of its divisors is an integer number (850005691920).

Almost surely, 2^{21170661016152} is an apocalyptic number.

It is an amenable number.

21170661016152 is an abundant number, since it is smaller than the sum of its proper divisors (33229703266728).

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

21170661016152 is a wasteful number, since it uses less digits than its factorization.

21170661016152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91992232 (or 91992228 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 39.

The spelling of 21170661016152 in words is "twenty-one trillion, one hundred seventy billion, six hundred sixty-one million, sixteen thousand, one hundred fifty-two".