21338264079 has 20 divisors (see below), whose sum is σ = 34773468840. Its totient is φ = 12932280720.

The previous prime is 21338264071. The next prime is 21338264107. The reversal of 21338264079 is 97046283312.

21338264079 is a `hidden beast` number, since 213 + 3 + 8 + 26 + 407 + 9 = 666.

It is not a de Polignac number, because 21338264079 - 2³ = 21338264071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21338264071) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 11973444 + ... + 11975225.

It is an arithmetic number, because the mean of its divisors is an integer number (1738673442).

Almost surely, 2^21338264079 is an apocalyptic number.

21338264079 is a deficient number, since it is larger than the sum of its proper divisors (13435204761).

21338264079 is a wasteful number, since it uses less digits than its factorization.

21338264079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23948692 (or 23948683 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The spelling of 21338264079 in words is "twenty-one billion, three hundred thirty-eight million, two hundred sixty-four thousand, seventy-nine".