21261634334 has 12 divisors (see below), whose sum is σ = 33659347464. Its totient is φ = 10071300132.

The previous prime is 21261634319. The next prime is 21261634351. The reversal of 21261634334 is 43343616212.

It is a junction number, because it is equal to n+sod(n) for n = 21261634294 and 21261634303.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 14723402 + ... + 14724845.

It is an arithmetic number, because the mean of its divisors is an integer number (2804945622).

Almost surely, 2^21261634334 is an apocalyptic number.

21261634334 is a deficient number, since it is larger than the sum of its proper divisors (12397713130).

21261634334 is a wasteful number, since it uses less digits than its factorization.

21261634334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29448287 (or 29448268 counting only the distinct ones).

The product of its digits is 62208, while the sum is 35.

The spelling of 21261634334 in words is "twenty-one billion, two hundred sixty-one million, six hundred thirty-four thousand, three hundred thirty-four".