1253615421 has 32 divisors (see below), whose sum is σ = 1831104000. Its totient is φ = 760148928.

The previous prime is 1253615401. The next prime is 1253615501. The reversal of 1253615421 is 1245163521.

It is not a de Polignac number, because 1253615421 - 2⁶ = 1253615357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1253615401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 140275 + ... + 148943.

It is an arithmetic number, because the mean of its divisors is an integer number (57222000).

Almost surely, 2^1253615421 is an apocalyptic number.

It is an amenable number.

1253615421 is a deficient number, since it is larger than the sum of its proper divisors (577488579).

1253615421 is a wasteful number, since it uses less digits than its factorization.

1253615421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8793.

The product of its digits is 7200, while the sum is 30.

The square root of 1253615421 is about 35406.4319156845. The cubic root of 1253615421 is about 1078.2549037910.

Adding to 1253615421 its reverse (1245163521), we get a palindrome (2498778942).

The spelling of 1253615421 in words is "one billion, two hundred fifty-three million, six hundred fifteen thousand, four hundred twenty-one".