21216404165160 has 128 divisors (see below), whose sum is σ = 66534089932800. Its totient is φ = 5405894657280.

The previous prime is 21216404165147. The next prime is 21216404165171. The reversal of 21216404165160 is 6156140461212.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35803174 + ... + 36390933.

It is an arithmetic number, because the mean of its divisors is an integer number (519797577600).

Almost surely, 2^{21216404165160} is an apocalyptic number.

21216404165160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21216404165160 is an abundant number, since it is smaller than the sum of its proper divisors (45317685767640).

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

21216404165160 is a wasteful number, since it uses less digits than its factorization.

21216404165160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72194231 (or 72194227 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The spelling of 21216404165160 in words is "twenty-one trillion, two hundred sixteen billion, four hundred four million, one hundred sixty-five thousand, one hundred sixty".