1221333013200 has 120 divisors (see below), whose sum is σ = 3934952084448. Its totient is φ = 323806154240.

The previous prime is 1221333013189. The next prime is 1221333013231. The reversal of 1221333013200 is 23103331221.

It is a tau number, because it is divible by the number of its divisors (120).

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, 2733954 + ... + 3149153.

Almost surely, 2^{1221333013200} is an apocalyptic number.

1221333013200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221333013200 is an abundant number, since it is smaller than the sum of its proper divisors (2713619071248).

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

1221333013200 is a wasteful number, since it uses less digits than its factorization.

1221333013200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5883301 (or 5883290 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 1221333013200 its reverse (23103331221), we get a palindrome (1244436344421).

The spelling of 1221333013200 in words is "one trillion, two hundred twenty-one billion, three hundred thirty-three million, thirteen thousand, two hundred".