20272157321521 has 16 divisors (see below), whose sum is σ = 23421593938176. Its totient is φ = 17186297204736.

The previous prime is 20272157321489. The next prime is 20272157321567. The reversal of 20272157321521 is 12512375127202.

It is a cyclic number.

It is not a de Polignac number, because 20272157321521 - 2⁵ = 20272157321489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20272157321921) 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, 8198176 + ... + 10380481.

It is an arithmetic number, because the mean of its divisors is an integer number (1463849621136).

Almost surely, 2^{20272157321521} is an apocalyptic number.

It is an amenable number.

20272157321521 is a deficient number, since it is larger than the sum of its proper divisors (3149436616655).

20272157321521 is a wasteful number, since it uses less digits than its factorization.

20272157321521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18580368.

The product of its (nonzero) digits is 117600, while the sum is 40.

The spelling of 20272157321521 in words is "twenty trillion, two hundred seventy-two billion, one hundred fifty-seven million, three hundred twenty-one thousand, five hundred twenty-one".