21152211165292 has 24 divisors (see below), whose sum is σ = 37149063840000. Its totient is φ = 10538260448976.

The previous prime is 21152211165289. The next prime is 21152211165347. The reversal of 21152211165292 is 29256111225112.

It is a happy number.

It is a super-2 number, since 2×21152211165292² (a number of 27 digits) contains 22 as substring.

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, 7186792 + ... + 9693007.

It is an arithmetic number, because the mean of its divisors is an integer number (1547877660000).

Almost surely, 2^{21152211165292} is an apocalyptic number.

It is an amenable number.

21152211165292 is a deficient number, since it is larger than the sum of its proper divisors (15996852674708).

21152211165292 is a wasteful number, since it uses less digits than its factorization.

21152211165292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16880925 (or 16880923 counting only the distinct ones).

The product of its digits is 43200, while the sum is 40.

The spelling of 21152211165292 in words is "twenty-one trillion, one hundred fifty-two billion, two hundred eleven million, one hundred sixty-five thousand, two hundred ninety-two".