21231607767 has 16 divisors (see below), whose sum is σ = 28423319808. Its totient is φ = 14097202560.

The previous prime is 21231607757. The next prime is 21231607811. The reversal of 21231607767 is 76770613212.

It is not a de Polignac number, because 21231607767 - 2⁸ = 21231607511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231607757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2051967 + ... + 2062287.

It is an arithmetic number, because the mean of its divisors is an integer number (1776457488).

Almost surely, 2^21231607767 is an apocalyptic number.

21231607767 is a deficient number, since it is larger than the sum of its proper divisors (7191712041).

21231607767 is a wasteful number, since it uses less digits than its factorization.

21231607767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13030.

The product of its (nonzero) digits is 148176, while the sum is 42.

The spelling of 21231607767 in words is "twenty-one billion, two hundred thirty-one million, six hundred seven thousand, seven hundred sixty-seven".