23525220421 has 2 divisors, whose sum is σ = 23525220422. Its totient is φ = 23525220420.

The previous prime is 23525220403. The next prime is 23525220437. The reversal of 23525220421 is 12402252532.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20689657921 + 2835562500 = 143839^2 + 53250^2 .

It is a cyclic number.

It is not a de Polignac number, because 23525220421 - 2¹¹ = 23525218373 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23525220421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23525220401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11762610210 + 11762610211.

It is an arithmetic number, because the mean of its divisors is an integer number (11762610211).

Almost surely, 2^23525220421 is an apocalyptic number.

It is an amenable number.

23525220421 is a deficient number, since it is larger than the sum of its proper divisors (1).

23525220421 is an equidigital number, since it uses as much as digits as its factorization.

23525220421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9600, while the sum is 28.

Adding to 23525220421 its reverse (12402252532), we get a palindrome (35927472953).

The spelling of 23525220421 in words is "twenty-three billion, five hundred twenty-five million, two hundred twenty thousand, four hundred twenty-one".