23030021221 has 2 divisors, whose sum is σ = 23030021222. Its totient is φ = 23030021220.

The previous prime is 23030021177. The next prime is 23030021257. The reversal of 23030021221 is 12212003032.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21114996100 + 1915025121 = 145310^2 + 43761^2 .

It is a cyclic number.

It is not a de Polignac number, because 23030021221 - 2²⁷ = 22895803493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23030021195 and 23030021204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23030021281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11515010610 + 11515010611.

It is an arithmetic number, because the mean of its divisors is an integer number (11515010611).

Almost surely, 2^23030021221 is an apocalyptic number.

It is an amenable number.

23030021221 is a deficient number, since it is larger than the sum of its proper divisors (1).

23030021221 is an equidigital number, since it uses as much as digits as its factorization.

23030021221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 23030021221 its reverse (12212003032), we get a palindrome (35242024253).

The spelling of 23030021221 in words is "twenty-three billion, thirty million, twenty-one thousand, two hundred twenty-one".