21445165151 has 16 divisors (see below), whose sum is σ = 23557017600. Its totient is φ = 19434349440.

The previous prime is 21445165129. The next prime is 21445165177. The reversal of 21445165151 is 15156154412.

It is a cyclic number.

It is not a de Polignac number, because 21445165151 - 2¹⁰ = 21445164127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21445195151) 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, 2630 + ... + 207116.

It is an arithmetic number, because the mean of its divisors is an integer number (1472313600).

Almost surely, 2^21445165151 is an apocalyptic number.

21445165151 is a deficient number, since it is larger than the sum of its proper divisors (2111852449).

21445165151 is a wasteful number, since it uses less digits than its factorization.

21445165151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204734.

The product of its digits is 24000, while the sum is 35.

The spelling of 21445165151 in words is "twenty-one billion, four hundred forty-five million, one hundred sixty-five thousand, one hundred fifty-one".