1221415144000 has 56 divisors (see below), whose sum is σ = 3024834623928. Its totient is φ = 488566054400.

The previous prime is 1221415143961. The next prime is 1221415144073. The reversal of 1221415144000 is 4415141221.

It can be written as a sum of positive squares in 4 ways, for example, as 24176518144 + 1197238625856 = 155488^2 + 1094184^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

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, 76330447 + ... + 76346446.

Almost surely, 2^{1221415144000} is an apocalyptic number.

1221415144000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221415144000 is an abundant number, since it is smaller than the sum of its proper divisors (1803419479928).

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

1221415144000 is an equidigital number, since it uses as much as digits as its factorization.

1221415144000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152676920 (or 152676900 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

The spelling of 1221415144000 in words is "one trillion, two hundred twenty-one billion, four hundred fifteen million, one hundred forty-four thousand".