21628025233 has 4 divisors (see below), whose sum is σ = 22131002608. Its totient is φ = 21125047860.

The previous prime is 21628025227. The next prime is 21628025257. The reversal of 21628025233 is 33252082612.

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 21628025233 - 2⁵ = 21628025201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21628025213) 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, 251488623 + ... + 251488708.

It is an arithmetic number, because the mean of its divisors is an integer number (5532750652).

Almost surely, 2^21628025233 is an apocalyptic number.

It is an amenable number.

21628025233 is a deficient number, since it is larger than the sum of its proper divisors (502977375).

21628025233 is an equidigital number, since it uses as much as digits as its factorization.

21628025233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502977374.

The product of its (nonzero) digits is 34560, while the sum is 34.

The spelling of 21628025233 in words is "twenty-one billion, six hundred twenty-eight million, twenty-five thousand, two hundred thirty-three".