23211012221 has 4 divisors (see below), whose sum is σ = 23286618432. Its totient is φ = 23135406012.

The previous prime is 23211012191. The next prime is 23211012229. The reversal of 23211012221 is 12221011232.

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 23211012221 - 2⁶ = 23211012157 is a prime.

It is a super-2 number, since 2×23211012221² (a number of 22 digits) contains 22 as substring.

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 23211012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23211012229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37802645 + ... + 37803258.

It is an arithmetic number, because the mean of its divisors is an integer number (5821654608).

Almost surely, 2^23211012221 is an apocalyptic number.

It is an amenable number.

23211012221 is a deficient number, since it is larger than the sum of its proper divisors (75606211).

23211012221 is an equidigital number, since it uses as much as digits as its factorization.

23211012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75606210.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 23211012221 its reverse (12221011232), we get a palindrome (35432023453).

The spelling of 23211012221 in words is "twenty-three billion, two hundred eleven million, twelve thousand, two hundred twenty-one".