21264212759 has 8 divisors (see below), whose sum is σ = 21399134592. Its totient is φ = 21129345720.

The previous prime is 21264212743. The next prime is 21264212777. The reversal of 21264212759 is 95721246212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21264212759 - 2⁴ = 21264212743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21264212719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1000574 + ... + 1021604.

It is an arithmetic number, because the mean of its divisors is an integer number (2674891824).

Almost surely, 2^21264212759 is an apocalyptic number.

21264212759 is a deficient number, since it is larger than the sum of its proper divisors (134921833).

21264212759 is a wasteful number, since it uses less digits than its factorization.

21264212759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27397.

The product of its digits is 120960, while the sum is 41.

The spelling of 21264212759 in words is "twenty-one billion, two hundred sixty-four million, two hundred twelve thousand, seven hundred fifty-nine".