1221882900 has 144 divisors (see below), whose sum is σ = 4051407360. Its totient is φ = 278524800.

The previous prime is 1221882877. The next prime is 1221882901. The reversal of 1221882900 is 92881221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221882901) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1198591 + ... + 1199609.

Almost surely, 2^1221882900 is an apocalyptic number.

1221882900 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 1221882900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2025703680).

1221882900 is an abundant number, since it is smaller than the sum of its proper divisors (2829524460).

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

1221882900 is a wasteful number, since it uses less digits than its factorization.

1221882900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1614 (or 1607 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 1221882900 is about 34955.4416364606. The cubic root of 1221882900 is about 1069.0791565064.

The spelling of 1221882900 in words is "one billion, two hundred twenty-one million, eight hundred eighty-two thousand, nine hundred".