21269665252 has 12 divisors (see below), whose sum is σ = 40605724656. Its totient is φ = 9668029640.

The previous prime is 21269665189. The next prime is 21269665283. The reversal of 21269665252 is 25256696212.

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 3 ways as a sum of consecutive naturals, for example, 241700698 + ... + 241700785.

It is an arithmetic number, because the mean of its divisors is an integer number (3383810388).

Almost surely, 2^21269665252 is an apocalyptic number.

21269665252 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21269665252 is a deficient number, since it is larger than the sum of its proper divisors (19336059404).

21269665252 is a wasteful number, since it uses less digits than its factorization.

21269665252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483401498 (or 483401496 counting only the distinct ones).

The product of its digits is 777600, while the sum is 46.

The spelling of 21269665252 in words is "twenty-one billion, two hundred sixty-nine million, six hundred sixty-five thousand, two hundred fifty-two".