1321220331402 has 64 divisors (see below), whose sum is σ = 2699145566208. Its totient is φ = 431054568000.

The previous prime is 1321220331373. The next prime is 1321220331427. The reversal of 1321220331402 is 2041330221231.

It is a super-2 number, since 2×1321220331402² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45246627 + ... + 45275817.

It is an arithmetic number, because the mean of its divisors is an integer number (42174149472).

Almost surely, 2^{1321220331402} is an apocalyptic number.

1321220331402 is an abundant number, since it is smaller than the sum of its proper divisors (1377925234806).

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

1321220331402 is a wasteful number, since it uses less digits than its factorization.

1321220331402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30035.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 1321220331402 its reverse (2041330221231), we get a palindrome (3362550552633).

The spelling of 1321220331402 in words is "one trillion, three hundred twenty-one billion, two hundred twenty million, three hundred thirty-one thousand, four hundred two".