2151643800 has 48 divisors (see below), whose sum is σ = 6670097640. Its totient is φ = 573771520.

The previous prime is 2151643799. The next prime is 2151643807. The reversal of 2151643800 is 83461512.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151643807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1792437 + ... + 1793636.

Almost surely, 2^2151643800 is an apocalyptic number.

2151643800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2151643800 is an abundant number, since it is smaller than the sum of its proper divisors (4518453840).

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

2151643800 is a wasteful number, since it uses less digits than its factorization.

2151643800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3586092 (or 3586083 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 2151643800 is about 46385.8146419786. The cubic root of 2151643800 is about 1290.9917258181.

The spelling of 2151643800 in words is "two billion, one hundred fifty-one million, six hundred forty-three thousand, eight hundred".