1421531321 has 4 divisors (see below), whose sum is σ = 1624607232. Its totient is φ = 1218455412.

The previous prime is 1421531311. The next prime is 1421531323. The reversal of 1421531321 is 1231351241.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1421531321 - 2²² = 1417337017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1421531323) 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 3 ways as a sum of consecutive naturals, for example, 101537945 + ... + 101537958.

It is an arithmetic number, because the mean of its divisors is an integer number (406151808).

Almost surely, 2^1421531321 is an apocalyptic number.

It is an amenable number.

1421531321 is a deficient number, since it is larger than the sum of its proper divisors (203075911).

1421531321 is an equidigital number, since it uses as much as digits as its factorization.

1421531321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203075910.

The product of its digits is 720, while the sum is 23.

The square root of 1421531321 is about 37703.2004079229. The cubic root of 1421531321 is about 1124.3947548671.

Adding to 1421531321 its reverse (1231351241), we get a palindrome (2652882562).

The spelling of 1421531321 in words is "one billion, four hundred twenty-one million, five hundred thirty-one thousand, three hundred twenty-one".