21052788827 has 4 divisors (see below), whose sum is σ = 24060330096. Its totient is φ = 18045247560.

The previous prime is 21052788761. The next prime is 21052788847. The reversal of 21052788827 is 72888725012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21052788827 - 2⁸ = 21052788571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21052788847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1503770624 + ... + 1503770637.

It is an arithmetic number, because the mean of its divisors is an integer number (6015082524).

Almost surely, 2^21052788827 is an apocalyptic number.

21052788827 is a deficient number, since it is larger than the sum of its proper divisors (3007541269).

21052788827 is an equidigital number, since it uses as much as digits as its factorization.

21052788827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3007541268.

The product of its (nonzero) digits is 1003520, while the sum is 50.

The spelling of 21052788827 in words is "twenty-one billion, fifty-two million, seven hundred eighty-eight thousand, eight hundred twenty-seven".