1621116900 has 216 divisors, whose sum is σ = 5520313344. Its totient is φ = 395539200.

The previous prime is 1621116881. The next prime is 1621116911. The reversal of 1621116900 is 96111261.

It is a super-2 number, since 2×1621116900² = 5256040006931220000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1485355 + ... + 1486445.

Almost surely, 2^1621116900 is an apocalyptic number.

1621116900 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 1621116900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2760156672).

1621116900 is an abundant number, since it is smaller than the sum of its proper divisors (3899196444).

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

1621116900 is a wasteful number, since it uses less digits than its factorization.

1621116900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1251 (or 1241 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 1621116900 is about 40263.0960061444. The cubic root of 1621116900 is about 1174.7301387201.

The spelling of 1621116900 in words is "one billion, six hundred twenty-one million, one hundred sixteen thousand, nine hundred".