23221223221 has 16 divisors (see below), whose sum is σ = 27184025088. Its totient is φ = 19420758000.

The previous prime is 23221223209. The next prime is 23221223239. The reversal of 23221223221 is 12232212232.

It is not a de Polignac number, because 23221223221 - 2⁷ = 23221223093 is a prime.

It is a super-2 number, since 2×23221223221² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23221223192 and 23221223201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23221227221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 252546 + ... + 331996.

It is an arithmetic number, because the mean of its divisors is an integer number (1699001568).

Almost surely, 2^23221223221 is an apocalyptic number.

It is an amenable number.

23221223221 is a deficient number, since it is larger than the sum of its proper divisors (3962801867).

23221223221 is an equidigital number, since it uses as much as digits as its factorization.

23221223221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80472.

The product of its digits is 1152, while the sum is 22.

Adding to 23221223221 its reverse (12232212232), we get a palindrome (35453435453).

The spelling of 23221223221 in words is "twenty-three billion, two hundred twenty-one million, two hundred twenty-three thousand, two hundred twenty-one".