1321020022200 has 96 divisors (see below), whose sum is σ = 4096754755200. Its totient is φ = 352135000960.

The previous prime is 1321020022177. The next prime is 1321020022237. The reversal of 1321020022200 is 22200201231.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1321020022200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1120549 + ... + 1974251.

It is an arithmetic number, because the mean of its divisors is an integer number (42674528700).

Almost surely, 2^{1321020022200} is an apocalyptic number.

1321020022200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321020022200 is an abundant number, since it is smaller than the sum of its proper divisors (2775734733000).

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

1321020022200 is a wasteful number, since it uses less digits than its factorization.

1321020022200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856301 (or 856292 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 1321020022200 its reverse (22200201231), we get a palindrome (1343220223431).

The spelling of 1321020022200 in words is "one trillion, three hundred twenty-one billion, twenty million, twenty-two thousand, two hundred".