21331814207 has 16 divisors (see below), whose sum is σ = 23851929600. Its totient is φ = 18913688640.

The previous prime is 21331814173. The next prime is 21331814219. The reversal of 21331814207 is 70241813312.

It is not a de Polignac number, because 21331814207 - 2¹⁸ = 21331552063 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 (21331814297) 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, 46982 + ... + 211827.

It is an arithmetic number, because the mean of its divisors is an integer number (1490745600).

Almost surely, 2^21331814207 is an apocalyptic number.

21331814207 is a deficient number, since it is larger than the sum of its proper divisors (2520115393).

21331814207 is a wasteful number, since it uses less digits than its factorization.

21331814207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259006.

The product of its (nonzero) digits is 8064, while the sum is 32.

It can be divided in two parts, 21331 and 814207, that added together give a palindrome (835538).

The spelling of 21331814207 in words is "twenty-one billion, three hundred thirty-one million, eight hundred fourteen thousand, two hundred seven".