21294133678 has 16 divisors (see below), whose sum is σ = 33673089024. Its totient is φ = 10084385880.

The previous prime is 21294133643. The next prime is 21294133711. The reversal of 21294133678 is 87633149212.

It is a congruent 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, 3650850 + ... + 3656677.

It is an arithmetic number, because the mean of its divisors is an integer number (2104568064).

Almost surely, 2^21294133678 is an apocalyptic number.

21294133678 is a deficient number, since it is larger than the sum of its proper divisors (12378955346).

21294133678 is a wasteful number, since it uses less digits than its factorization.

21294133678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7307607.

The product of its digits is 435456, while the sum is 46.

The spelling of 21294133678 in words is "twenty-one billion, two hundred ninety-four million, one hundred thirty-three thousand, six hundred seventy-eight".