21274347633 has 64 divisors (see below), whose sum is σ = 37499258880. Its totient is φ = 10393228800.

The previous prime is 21274347613. The next prime is 21274347641. The reversal of 21274347633 is 33674347212.

It is not a de Polignac number, because 21274347633 - 2⁸ = 21274347377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21274347613) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 583603 + ... + 618983.

It is an arithmetic number, because the mean of its divisors is an integer number (585925920).

Almost surely, 2^21274347633 is an apocalyptic number.

It is an amenable number.

21274347633 is a deficient number, since it is larger than the sum of its proper divisors (16224911247).

21274347633 is a wasteful number, since it uses less digits than its factorization.

21274347633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35558.

The product of its digits is 508032, while the sum is 42.

The spelling of 21274347633 in words is "twenty-one billion, two hundred seventy-four million, three hundred forty-seven thousand, six hundred thirty-three".