1221323213200 has 60 divisors (see below), whose sum is σ = 2953661146048. Its totient is φ = 485293968000.

The previous prime is 1221323213177. The next prime is 1221323213219. The reversal of 1221323213200 is 23123231221.

It is a super-2 number, since 2×1221323213200² (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 11 ways as a sum of consecutive naturals, for example, 10049892 + ... + 10170691.

Almost surely, 2^{1221323213200} is an apocalyptic number.

1221323213200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221323213200 is an abundant number, since it is smaller than the sum of its proper divisors (1732337932848).

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

1221323213200 is a wasteful number, since it uses less digits than its factorization.

1221323213200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20220752 (or 20220741 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 1221323213200 its reverse (23123231221), we get a palindrome (1244446444421).

The spelling of 1221323213200 in words is "one trillion, two hundred twenty-one billion, three hundred twenty-three million, two hundred thirteen thousand, two hundred".