23020013221 has 2 divisors, whose sum is σ = 23020013222. Its totient is φ = 23020013220.

The previous prime is 23020013183. The next prime is 23020013323. The reversal of 23020013221 is 12231002032.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18020109121 + 4999904100 = 134239^2 + 70710^2 .

It is a cyclic number.

It is not a de Polignac number, because 23020013221 - 2²¹ = 23017916069 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23020013195 and 23020013204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23020013921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11510006610 + 11510006611.

It is an arithmetic number, because the mean of its divisors is an integer number (11510006611).

Almost surely, 2^23020013221 is an apocalyptic number.

It is an amenable number.

23020013221 is a deficient number, since it is larger than the sum of its proper divisors (1).

23020013221 is an equidigital number, since it uses as much as digits as its factorization.

23020013221 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 23020013221 its reverse (12231002032), we get a palindrome (35251015253).

The spelling of 23020013221 in words is "twenty-three billion, twenty million, thirteen thousand, two hundred twenty-one".