21252207893 has 4 divisors (see below), whose sum is σ = 24288237600. Its totient is φ = 18216178188.

The previous prime is 21252207881. The next prime is 21252207923. The reversal of 21252207893 is 39870225212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21252207893 - 2²⁶ = 21185099029 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21252207893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21252207803) 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, 1518014843 + ... + 1518014856.

It is an arithmetic number, because the mean of its divisors is an integer number (6072059400).

Almost surely, 2^21252207893 is an apocalyptic number.

It is an amenable number.

21252207893 is a deficient number, since it is larger than the sum of its proper divisors (3036029707).

21252207893 is an equidigital number, since it uses as much as digits as its factorization.

21252207893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3036029706.

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

The spelling of 21252207893 in words is "twenty-one billion, two hundred fifty-two million, two hundred seven thousand, eight hundred ninety-three".