23221005157 has 4 divisors (see below), whose sum is σ = 26538291616. Its totient is φ = 19903718700.

The previous prime is 23221005103. The next prime is 23221005161. The reversal of 23221005157 is 75150012232.

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 23221005157 - 2²⁷ = 23086787429 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 (23221005187) 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, 1658643219 + ... + 1658643232.

It is an arithmetic number, because the mean of its divisors is an integer number (6634572904).

Almost surely, 2^23221005157 is an apocalyptic number.

It is an amenable number.

23221005157 is a deficient number, since it is larger than the sum of its proper divisors (3317286459).

23221005157 is an equidigital number, since it uses as much as digits as its factorization.

23221005157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3317286458.

The product of its (nonzero) digits is 4200, while the sum is 28.

Adding to 23221005157 its reverse (75150012232), we get a palindrome (98371017389).

The spelling of 23221005157 in words is "twenty-three billion, two hundred twenty-one million, five thousand, one hundred fifty-seven".