21264269765949 has 48 divisors (see below), whose sum is σ = 38801548713600. Its totient is φ = 11436245912448.

The previous prime is 21264269765927. The next prime is 21264269765953. The reversal of 21264269765949 is 94956796246212.

21264269765949 is a `hidden beast` number, since 2 + 1 + 2 + 6 + 4 + 26 + 9 + 7 + 6 + 594 + 9 = 666.

It is not a de Polignac number, because 21264269765949 - 2⁹ = 21264269765437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21264269765149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 472705929 + ... + 472750910.

It is an arithmetic number, because the mean of its divisors is an integer number (808365598200).

Almost surely, 2^{21264269765949} is an apocalyptic number.

It is an amenable number.

21264269765949 is a deficient number, since it is larger than the sum of its proper divisors (17537278947651).

21264269765949 is a wasteful number, since it uses less digits than its factorization.

21264269765949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 945456879 (or 945456866 counting only the distinct ones).

The product of its digits is 705438720, while the sum is 72.

The spelling of 21264269765949 in words is "twenty-one trillion, two hundred sixty-four billion, two hundred sixty-nine million, seven hundred sixty-five thousand, nine hundred forty-nine".