21152155121156 has 24 divisors (see below), whose sum is σ = 37428718803840. Its totient is φ = 10458888328800.

The previous prime is 21152155121137. The next prime is 21152155121177. The reversal of 21152155121156 is 65112155125112.

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, 81478460 + ... + 81737651.

It is an arithmetic number, because the mean of its divisors is an integer number (1559529950160).

Almost surely, 2^{21152155121156} is an apocalyptic number.

It is an amenable number.

21152155121156 is a deficient number, since it is larger than the sum of its proper divisors (16276563682684).

21152155121156 is a wasteful number, since it uses less digits than its factorization.

21152155121156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163216475 (or 163216473 counting only the distinct ones).

The product of its digits is 30000, while the sum is 38.

The spelling of 21152155121156 in words is "twenty-one trillion, one hundred fifty-two billion, one hundred fifty-five million, one hundred twenty-one thousand, one hundred fifty-six".