22504231455221 has 2 divisors, whose sum is σ = 22504231455222. Its totient is φ = 22504231455220.

The previous prime is 22504231455179. The next prime is 22504231455229. The reversal of 22504231455221 is 12255413240522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17396315050321 + 5107916404900 = 4170889^2 + 2260070^2 .

It is a cyclic number.

It is not a de Polignac number, because 22504231455221 - 2¹⁸ = 22504231193077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22504231455229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11252115727610 + 11252115727611.

It is an arithmetic number, because the mean of its divisors is an integer number (11252115727611).

Almost surely, 2^{22504231455221} is an apocalyptic number.

It is an amenable number.

22504231455221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22504231455221 is an equidigital number, since it uses as much as digits as its factorization.

22504231455221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192000, while the sum is 38.

Adding to 22504231455221 its reverse (12255413240522), we get a palindrome (34759644695743).

The spelling of 22504231455221 in words is "twenty-two trillion, five hundred four billion, two hundred thirty-one million, four hundred fifty-five thousand, two hundred twenty-one".