21226504253 has 2 divisors, whose sum is σ = 21226504254. Its totient is φ = 21226504252.

The previous prime is 21226504223. The next prime is 21226504259. The reversal of 21226504253 is 35240562212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16662420889 + 4564083364 = 129083^2 + 67558^2 .

It is a cyclic number.

It is not a de Polignac number, because 21226504253 - 2¹² = 21226500157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21226504259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10613252126 + 10613252127.

It is an arithmetic number, because the mean of its divisors is an integer number (10613252127).

Almost surely, 2^21226504253 is an apocalyptic number.

It is an amenable number.

21226504253 is a deficient number, since it is larger than the sum of its proper divisors (1).

21226504253 is an equidigital number, since it uses as much as digits as its factorization.

21226504253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 32.

The spelling of 21226504253 in words is "twenty-one billion, two hundred twenty-six million, five hundred four thousand, two hundred fifty-three".