2157996900 has 36 divisors (see below), whose sum is σ = 6243805232. Its totient is φ = 575465760.

The previous prime is 2157996899. The next prime is 2157996901. The reversal of 2157996900 is 96997512.

It is an interprime number because it is at equal distance from previous prime (2157996899) and next prime (2157996901).

It is a super-2 number, since 2×2157996900² = 9313901240819220000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2157996900.

It is not an unprimeable number, because it can be changed into a prime (2157996901) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 3596362 + ... + 3596961.

Almost surely, 2^2157996900 is an apocalyptic number.

2157996900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2157996900 is an abundant number, since it is smaller than the sum of its proper divisors (4085808332).

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

2157996900 is a wasteful number, since it uses less digits than its factorization.

2157996900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7193340 (or 7193333 counting only the distinct ones).

The product of its (nonzero) digits is 306180, while the sum is 48.

The square root of 2157996900 is about 46454.2452311950. The cubic root of 2157996900 is about 1292.2611026451.

The spelling of 2157996900 in words is "two billion, one hundred fifty-seven million, nine hundred ninety-six thousand, nine hundred".