1321234334420 has 576 divisors, whose sum is σ = 3967057436160. Its totient is φ = 358676398080.

The previous prime is 1321234334411. The next prime is 1321234334423. The reversal of 1321234334420 is 244334321231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321234334423) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1410068192 + ... + 1410069128.

Almost surely, 2^{1321234334420} is an apocalyptic number.

1321234334420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321234334420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1983528718080).

1321234334420 is an abundant number, since it is smaller than the sum of its proper divisors (2645823101740).

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

1321234334420 is a wasteful number, since it uses less digits than its factorization.

1321234334420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344 (or 1331 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 32.

Adding to 1321234334420 its reverse (244334321231), we get a palindrome (1565568655651).

The spelling of 1321234334420 in words is "one trillion, three hundred twenty-one billion, two hundred thirty-four million, three hundred thirty-four thousand, four hundred twenty".