21265951933 has 8 divisors (see below), whose sum is σ = 22542997248. Its totient is φ = 19991807424.

The previous prime is 21265951921. The next prime is 21265951939. The reversal of 21265951933 is 33915956212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-21265951933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21265951939) 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, 710091 + ... + 739432.

It is an arithmetic number, because the mean of its divisors is an integer number (2817874656).

Almost surely, 2^21265951933 is an apocalyptic number.

It is an amenable number.

21265951933 is a deficient number, since it is larger than the sum of its proper divisors (1277045315).

21265951933 is a wasteful number, since it uses less digits than its factorization.

21265951933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1450403.

The product of its digits is 437400, while the sum is 46.

The spelling of 21265951933 in words is "twenty-one billion, two hundred sixty-five million, nine hundred fifty-one thousand, nine hundred thirty-three".