1321333431 has 12 divisors (see below), whose sum is σ = 1936500216. Its totient is φ = 800807920.

The previous prime is 1321333411. The next prime is 1321333439. The reversal of 1321333431 is 1343331231.

It is a happy number.

It is not a de Polignac number, because 1321333431 - 2⁹ = 1321332919 is a prime.

It is a super-2 number, since 2×1321333431² = 3491844071756463522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321333439) 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, 1819656 + ... + 1820381.

It is an arithmetic number, because the mean of its divisors is an integer number (161375018).

Almost surely, 2^1321333431 is an apocalyptic number.

1321333431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1321333431 is a deficient number, since it is larger than the sum of its proper divisors (615166785).

1321333431 is a wasteful number, since it uses less digits than its factorization.

1321333431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3640062 (or 3640051 counting only the distinct ones).

The product of its digits is 1944, while the sum is 24.

The square root of 1321333431 is about 36350.1503573231. The cubic root of 1321333431 is about 1097.3305604760.

Adding to 1321333431 its reverse (1343331231), we get a palindrome (2664664662).

The spelling of 1321333431 in words is "one billion, three hundred twenty-one million, three hundred thirty-three thousand, four hundred thirty-one".