1313121421 has 12 divisors (see below), whose sum is σ = 1362244000. Its totient is φ = 1265716368.

The previous prime is 1313121367. The next prime is 1313121437. The reversal of 1313121421 is 1241213131.

It is not a de Polignac number, because 1313121421 - 2¹¹ = 1313119373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313121461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 772030 + ... + 773728.

Almost surely, 2^1313121421 is an apocalyptic number.

It is an amenable number.

1313121421 is a deficient number, since it is larger than the sum of its proper divisors (49122579).

1313121421 is an equidigital number, since it uses as much as digits as its factorization.

1313121421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2676 (or 2647 counting only the distinct ones).

The product of its digits is 144, while the sum is 19.

The square root of 1313121421 is about 36237.0172751566. The cubic root of 1313121421 is about 1095.0525529569.

Adding to 1313121421 its reverse (1241213131), we get a palindrome (2554334552).

The spelling of 1313121421 in words is "one billion, three hundred thirteen million, one hundred twenty-one thousand, four hundred twenty-one".