21980803634 has 16 divisors (see below), whose sum is σ = 34181222400. Its totient is φ = 10588686864.

The previous prime is 21980803609. The next prime is 21980803651. The reversal of 21980803634 is 43630808912.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 378674 + ... + 432845.

It is an arithmetic number, because the mean of its divisors is an integer number (2136326400).

Almost surely, 2^21980803634 is an apocalyptic number.

21980803634 is a deficient number, since it is larger than the sum of its proper divisors (12200418766).

21980803634 is a wasteful number, since it uses less digits than its factorization.

21980803634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812017.

The product of its (nonzero) digits is 248832, while the sum is 44.

The spelling of 21980803634 in words is "twenty-one billion, nine hundred eighty million, eight hundred three thousand, six hundred thirty-four".