23311002221 has 4 divisors (see below), whose sum is σ = 25104156252. Its totient is φ = 21517848192.

The previous prime is 23311002199. The next prime is 23311002229. The reversal of 23311002221 is 12220011332.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3958297225 + 19352704996 = 62915^2 + 139114^2 .

It is a cyclic number.

It is not a de Polignac number, because 23311002221 - 2¹⁸ = 23310740077 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23311002221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23311002229) 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, 896576996 + ... + 896577021.

It is an arithmetic number, because the mean of its divisors is an integer number (6276039063).

Almost surely, 2^23311002221 is an apocalyptic number.

It is an amenable number.

23311002221 is a deficient number, since it is larger than the sum of its proper divisors (1793154031).

23311002221 is a wasteful number, since it uses less digits than its factorization.

23311002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1793154030.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 23311002221 its reverse (12220011332), we get a palindrome (35531013553).

The spelling of 23311002221 in words is "twenty-three billion, three hundred eleven million, two thousand, two hundred twenty-one".