1221330411400 has 48 divisors (see below), whose sum is σ = 3097738049040. Its totient is φ = 444120148800.

The previous prime is 1221330411397. The next prime is 1221330411401. The reversal of 1221330411400 is 41140331221.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (1221330411401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 277572894 + ... + 277577293.

It is an arithmetic number, because the mean of its divisors is an integer number (64536209355).

Almost surely, 2^{1221330411400} is an apocalyptic number.

1221330411400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221330411400 is an abundant number, since it is smaller than the sum of its proper divisors (1876407637640).

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

1221330411400 is a wasteful number, since it uses less digits than its factorization.

1221330411400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555150214 (or 555150205 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 1221330411400 its reverse (41140331221), we get a palindrome (1262470742621).

The spelling of 1221330411400 in words is "one trillion, two hundred twenty-one billion, three hundred thirty million, four hundred eleven thousand, four hundred".