1221400202304 has 56 divisors (see below), whose sum is σ = 3270556608480. Its totient is φ = 402228173824.

The previous prime is 1221400202263. The next prime is 1221400202371. The reversal of 1221400202304 is 4032020041221.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38306109 + ... + 38337980.

It is an arithmetic number, because the mean of its divisors is an integer number (58402796580).

Almost surely, 2^{1221400202304} is an apocalyptic number.

It is an amenable number.

1221400202304 is an abundant number, since it is smaller than the sum of its proper divisors (2049156406176).

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

1221400202304 is an equidigital number, since it uses as much as digits as its factorization.

1221400202304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76644187 (or 76644177 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 1221400202304 its reverse (4032020041221), we get a palindrome (5253420243525).

The spelling of 1221400202304 in words is "one trillion, two hundred twenty-one billion, four hundred million, two hundred two thousand, three hundred four".