21252885707 has 8 divisors (see below), whose sum is σ = 22184596896. Its totient is φ = 20321813952.

The previous prime is 21252885691. The next prime is 21252885721. The reversal of 21252885707 is 70758825212.

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 21252885707 - 2⁴ = 21252885691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21252885757) 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, 91298 + ... + 225479.

It is an arithmetic number, because the mean of its divisors is an integer number (2773074612).

Almost surely, 2^21252885707 is an apocalyptic number.

21252885707 is a deficient number, since it is larger than the sum of its proper divisors (931711189).

21252885707 is a wasteful number, since it uses less digits than its factorization.

21252885707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319717.

The product of its (nonzero) digits is 627200, while the sum is 47.

The spelling of 21252885707 in words is "twenty-one billion, two hundred fifty-two million, eight hundred eighty-five thousand, seven hundred seven".