1321131421 has 12 divisors (see below), whose sum is σ = 1408024800. Its totient is φ = 1239335360.

The previous prime is 1321131407. The next prime is 1321131437. The reversal of 1321131421 is 1241311231.

It is not a de Polignac number, because 1321131421 - 2¹¹ = 1321129373 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 (1321131451) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82530 + ... + 97228.

It is an arithmetic number, because the mean of its divisors is an integer number (117335400).

Almost surely, 2^1321131421 is an apocalyptic number.

It is an amenable number.

1321131421 is a deficient number, since it is larger than the sum of its proper divisors (86893379).

1321131421 is a wasteful number, since it uses less digits than its factorization.

1321131421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15044 (or 15027 counting only the distinct ones).

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

The square root of 1321131421 is about 36347.3715831008. The cubic root of 1321131421 is about 1097.2746364024.

Adding to 1321131421 its reverse (1241311231), we get a palindrome (2562442652).

The spelling of 1321131421 in words is "one billion, three hundred twenty-one million, one hundred thirty-one thousand, four hundred twenty-one".