1253236365221 has 2 divisors, whose sum is σ = 1253236365222. Its totient is φ = 1253236365220.

The previous prime is 1253236365217. The next prime is 1253236365229. The reversal of 1253236365221 is 1225636323521.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 656928081121 + 596308284100 = 810511^2 + 772210^2 .

It is a cyclic number.

It is not a de Polignac number, because 1253236365221 - 2² = 1253236365217 is a prime.

It is a super-2 number, since 2×1253236365221² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1253236365229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626618182610 + 626618182611.

It is an arithmetic number, because the mean of its divisors is an integer number (626618182611).

Almost surely, 2^{1253236365221} is an apocalyptic number.

It is an amenable number.

1253236365221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1253236365221 is an equidigital number, since it uses as much as digits as its factorization.

1253236365221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 388800, while the sum is 41.

The spelling of 1253236365221 in words is "one trillion, two hundred fifty-three billion, two hundred thirty-six million, three hundred sixty-five thousand, two hundred twenty-one".