21642614834 has 16 divisors (see below), whose sum is σ = 33023601600. Its totient is φ = 10635484464.

The previous prime is 21642614809. The next prime is 21642614837. The reversal of 21642614834 is 43841624612.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21642614791 and 21642614800.

It is not an unprimeable number, because it can be changed into a prime (21642614837) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125129 + ... + 242780.

It is an arithmetic number, because the mean of its divisors is an integer number (2063975100).

Almost surely, 2^21642614834 is an apocalyptic number.

21642614834 is a deficient number, since it is larger than the sum of its proper divisors (11380986766).

21642614834 is a wasteful number, since it uses less digits than its factorization.

21642614834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368417.

The product of its digits is 221184, while the sum is 41.

The spelling of 21642614834 in words is "twenty-one billion, six hundred forty-two million, six hundred fourteen thousand, eight hundred thirty-four".