1221960000 has 280 divisors, whose sum is σ = 4284878400. Its totient is φ = 306176000.

The previous prime is 1221959993. The next prime is 1221960013. The reversal of 1221960000 is 691221.

It is a congruent number.

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 39 ways as a sum of consecutive naturals, for example, 2039701 + ... + 2040299.

Almost surely, 2^1221960000 is an apocalyptic number.

1221960000 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 1221960000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2142439200).

1221960000 is an abundant number, since it is smaller than the sum of its proper divisors (3062918400).

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

1221960000 is an equidigital number, since it uses as much as digits as its factorization.

1221960000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651 (or 626 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 1221960000 is about 34956.5444516474. The cubic root of 1221960000 is about 1069.1016420952.

The spelling of 1221960000 in words is "one billion, two hundred twenty-one million, nine hundred sixty thousand".