21132544145 has 32 divisors (see below), whose sum is σ = 26239859712. Its totient is φ = 16328374272.

The previous prime is 21132544079. The next prime is 21132544189. The reversal of 21132544145 is 54144523112.

It is a cyclic number.

It is not a de Polignac number, because 21132544145 - 2¹⁴ = 21132527761 is a prime.

It is a Duffinian number.

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, 14746349 + ... + 14747781.

It is an arithmetic number, because the mean of its divisors is an integer number (819995616).

Almost surely, 2^21132544145 is an apocalyptic number.

It is an amenable number.

21132544145 is a deficient number, since it is larger than the sum of its proper divisors (5107315567).

21132544145 is a wasteful number, since it uses less digits than its factorization.

21132544145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2201.

The product of its digits is 19200, while the sum is 32.

The spelling of 21132544145 in words is "twenty-one billion, one hundred thirty-two million, five hundred forty-four thousand, one hundred forty-five".