21207064076 has 24 divisors (see below), whose sum is σ = 41172425280. Its totient is φ = 9476190800.

The previous prime is 21207063989. The next prime is 21207064093. The reversal of 21207064076 is 67046070212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4081970 + ... + 4087161.

It is an arithmetic number, because the mean of its divisors is an integer number (1715517720).

Almost surely, 2^21207064076 is an apocalyptic number.

It is an amenable number.

21207064076 is a deficient number, since it is larger than the sum of its proper divisors (19965361204).

21207064076 is a wasteful number, since it uses less digits than its factorization.

21207064076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8169205 (or 8169203 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 35.

The spelling of 21207064076 in words is "twenty-one billion, two hundred seven million, sixty-four thousand, seventy-six".