1253974793921 has 2 divisors, whose sum is σ = 1253974793922. Its totient is φ = 1253974793920.

The previous prime is 1253974793917. The next prime is 1253974793927. The reversal of 1253974793921 is 1293974793521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1074821533696 + 179153260225 = 1036736^2 + 423265^2 .

It is a cyclic number.

It is not a de Polignac number, because 1253974793921 - 2² = 1253974793917 is a prime.

It is not a weakly prime, because it can be changed into another prime (1253974793927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626987396960 + 626987396961.

It is an arithmetic number, because the mean of its divisors is an integer number (626987396961).

Almost surely, 2^{1253974793921} is an apocalyptic number.

It is an amenable number.

1253974793921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1253974793921 is an equidigital number, since it uses as much as digits as its factorization.

1253974793921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25719120, while the sum is 62.

The spelling of 1253974793921 in words is "one trillion, two hundred fifty-three billion, nine hundred seventy-four million, seven hundred ninety-three thousand, nine hundred twenty-one".