21132570929 has 16 divisors (see below), whose sum is σ = 21799092864. Its totient is φ = 20477059200.

The previous prime is 21132570847. The next prime is 21132570931. The reversal of 21132570929 is 92907523112.

It is a cyclic number.

It is not a de Polignac number, because 21132570929 - 2¹⁶ = 21132505393 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21132570989) 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, 4588742 + ... + 4593344.

It is an arithmetic number, because the mean of its divisors is an integer number (1362443304).

Almost surely, 2^21132570929 is an apocalyptic number.

It is an amenable number.

21132570929 is a deficient number, since it is larger than the sum of its proper divisors (666521935).

21132570929 is a wasteful number, since it uses less digits than its factorization.

21132570929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5768.

The product of its (nonzero) digits is 68040, while the sum is 41.

The spelling of 21132570929 in words is "twenty-one billion, one hundred thirty-two million, five hundred seventy thousand, nine hundred twenty-nine".