1321204434431 has 8 divisors (see below), whose sum is σ = 1531214797824. Its totient is φ = 1116510789240.

The previous prime is 1321204434343. The next prime is 1321204434469. The reversal of 1321204434431 is 1344344021231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1321204434431 - 2³⁰ = 1320130692607 is a prime.

It is a super-2 number, since 2×1321204434431² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321204434131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1329179015 + ... + 1329180008.

It is an arithmetic number, because the mean of its divisors is an integer number (191401849728).

Almost surely, 2^{1321204434431} is an apocalyptic number.

1321204434431 is a deficient number, since it is larger than the sum of its proper divisors (210010363393).

1321204434431 is an equidigital number, since it uses as much as digits as its factorization.

1321204434431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2658359101.

The product of its (nonzero) digits is 27648, while the sum is 32.

Adding to 1321204434431 its reverse (1344344021231), we get a palindrome (2665548455662).

The spelling of 1321204434431 in words is "one trillion, three hundred twenty-one billion, two hundred four million, four hundred thirty-four thousand, four hundred thirty-one".