21631432451434 has 32 divisors (see below), whose sum is σ = 35759250039744. Its totient is φ = 9750593462400.

The previous prime is 21631432451381. The next prime is 21631432451441. The reversal of 21631432451434 is 43415423413612.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10410334 + ... + 12314134.

It is an arithmetic number, because the mean of its divisors is an integer number (1117476563742).

Almost surely, 2^{21631432451434} is an apocalyptic number.

21631432451434 is a deficient number, since it is larger than the sum of its proper divisors (14127817588310).

21631432451434 is a wasteful number, since it uses less digits than its factorization.

21631432451434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1914022.

The product of its digits is 829440, while the sum is 43.

The spelling of 21631432451434 in words is "twenty-one trillion, six hundred thirty-one billion, four hundred thirty-two million, four hundred fifty-one thousand, four hundred thirty-four".