21226765268 has 24 divisors (see below), whose sum is σ = 39409843200. Its totient is φ = 9975607488.

The previous prime is 21226765247. The next prime is 21226765279. The reversal of 21226765268 is 86256762212.

It is a happy number.

It is a super-2 number, since 2×21226765268² (a number of 21 digits) contains 22 as substring.

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, 1089953 + ... + 1109256.

It is an arithmetic number, because the mean of its divisors is an integer number (1642076800).

Almost surely, 2^21226765268 is an apocalyptic number.

It is an amenable number.

21226765268 is a deficient number, since it is larger than the sum of its proper divisors (18183077932).

21226765268 is a wasteful number, since it uses less digits than its factorization.

21226765268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2199359 (or 2199357 counting only the distinct ones).

The product of its digits is 967680, while the sum is 47.

The spelling of 21226765268 in words is "twenty-one billion, two hundred twenty-six million, seven hundred sixty-five thousand, two hundred sixty-eight".