1221415403200 has 84 divisors (see below), whose sum is σ = 3007981921032. Its totient is φ = 488153804800.

The previous prime is 1221415403189. The next prime is 1221415403203. The reversal of 1221415403200 is 23045141221.

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

It is not an unprimeable number, because it can be changed into a prime (1221415403203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1577640 + ... + 2220760.

Almost surely, 2^{1221415403200} is an apocalyptic number.

1221415403200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221415403200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1503990960516).

1221415403200 is an abundant number, since it is smaller than the sum of its proper divisors (1786566517832).

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

1221415403200 is a wasteful number, since it uses less digits than its factorization.

1221415403200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644330 (or 644315 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The spelling of 1221415403200 in words is "one trillion, two hundred twenty-one billion, four hundred fifteen million, four hundred three thousand, two hundred".