2100645252 has 60 divisors (see below), whose sum is σ = 5639952780. Its totient is φ = 681286464.

The previous prime is 2100645251. The next prime is 2100645259. The reversal of 2100645252 is 2525460012.

2100645252 is a `hidden beast` number, since 2 + 10 + 0 + 645 + 2 + 5 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1358954496 + 741690756 = 36864^2 + 27234^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (2100645251) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 75627 + ... + 99602.

It is an arithmetic number, because the mean of its divisors is an integer number (93999213).

Almost surely, 2^2100645252 is an apocalyptic number.

It is an amenable number.

2100645252 is an abundant number, since it is smaller than the sum of its proper divisors (3539307528).

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

2100645252 is a wasteful number, since it uses less digits than its factorization.

2100645252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175282 (or 175271 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 2100645252 is about 45832.7966853431. The cubic root of 2100645252 is about 1280.7103096941.

The spelling of 2100645252 in words is "two billion, one hundred million, six hundred forty-five thousand, two hundred fifty-two".