1321231121420 has 24 divisors (see below), whose sum is σ = 3170954691744. Its totient is φ = 452993527296.

The previous prime is 1321231121383. The next prime is 1321231121459. The reversal of 1321231121420 is 241211321231.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4718682437 + ... + 4718682716.

It is an arithmetic number, because the mean of its divisors is an integer number (132123112156).

Almost surely, 2^{1321231121420} is an apocalyptic number.

1321231121420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321231121420 is an abundant number, since it is smaller than the sum of its proper divisors (1849723570324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321231121420 is a wasteful number, since it uses less digits than its factorization.

1321231121420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9437365169 (or 9437365167 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 1321231121420 its reverse (241211321231), we get a palindrome (1562442442651).

The spelling of 1321231121420 in words is "one trillion, three hundred twenty-one billion, two hundred thirty-one million, one hundred twenty-one thousand, four hundred twenty".