1312633421 has 16 divisors (see below), whose sum is σ = 1441395648. Its totient is φ = 1185475200.

The previous prime is 1312633417. The next prime is 1312633429. The reversal of 1312633421 is 1243362131.

It is a cyclic number.

It is not a de Polignac number, because 1312633421 - 2² = 1312633417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312633429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1586810 + ... + 1587636.

It is an arithmetic number, because the mean of its divisors is an integer number (90087228).

Almost surely, 2^1312633421 is an apocalyptic number.

1312633421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1312633421 is a deficient number, since it is larger than the sum of its proper divisors (128762227).

1312633421 is a wasteful number, since it uses less digits than its factorization.

1312633421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1612.

The product of its digits is 2592, while the sum is 26.

The square root of 1312633421 is about 36230.2832034198. The cubic root of 1312633421 is about 1094.9168833862.

Adding to 1312633421 its reverse (1243362131), we get a palindrome (2555995552).

The spelling of 1312633421 in words is "one billion, three hundred twelve million, six hundred thirty-three thousand, four hundred twenty-one".