1252321621 has 2 divisors, whose sum is σ = 1252321622. Its totient is φ = 1252321620.

The previous prime is 1252321613. The next prime is 1252321633. The reversal of 1252321621 is 1261232521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 704106225 + 548215396 = 26535^2 + 23414^2 .

It is a cyclic number.

It is not a de Polignac number, because 1252321621 - 2³ = 1252321613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1252321661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626160810 + 626160811.

It is an arithmetic number, because the mean of its divisors is an integer number (626160811).

Almost surely, 2^1252321621 is an apocalyptic number.

It is an amenable number.

1252321621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1252321621 is an equidigital number, since it uses as much as digits as its factorization.

1252321621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 25.

The square root of 1252321621 is about 35388.1565075097. The cubic root of 1252321621 is about 1077.8838366711.

The spelling of 1252321621 in words is "one billion, two hundred fifty-two million, three hundred twenty-one thousand, six hundred twenty-one".