1221134311200 has 72 divisors (see below), whose sum is σ = 3974792190768. Its totient is φ = 325635815680.

The previous prime is 1221134311181. The next prime is 1221134311211. The reversal of 1221134311200 is 21134311221.

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, 254400582 + ... + 254405381.

It is an arithmetic number, because the mean of its divisors is an integer number (55205447094).

Almost surely, 2^{1221134311200} is an apocalyptic number.

1221134311200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221134311200 is an abundant number, since it is smaller than the sum of its proper divisors (2753657879568).

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

1221134311200 is a wasteful number, since it uses less digits than its factorization.

1221134311200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508805986 (or 508805973 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 1221134311200 its sum of digits (21), we get a palindrome (1221134311221).

Adding to 1221134311200 its reverse (21134311221), we get a palindrome (1242268622421).

The spelling of 1221134311200 in words is "one trillion, two hundred twenty-one billion, one hundred thirty-four million, three hundred eleven thousand, two hundred".