2157209852 has 24 divisors (see below), whose sum is σ = 4326196224. Its totient is φ = 921994992.

The previous prime is 2157209851. The next prime is 2157209867. The reversal of 2157209852 is 2589027512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157209851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94688 + ... + 115239.

It is an arithmetic number, because the mean of its divisors is an integer number (180258176).

Almost surely, 2^2157209852 is an apocalyptic number.

It is an amenable number.

2157209852 is an abundant number, since it is smaller than the sum of its proper divisors (2168986372).

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

2157209852 is a wasteful number, since it uses less digits than its factorization.

2157209852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210305 (or 210303 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 41.

The square root of 2157209852 is about 46445.7732414910. The cubic root of 2157209852 is about 1292.1039823719.

The spelling of 2157209852 in words is "two billion, one hundred fifty-seven million, two hundred nine thousand, eight hundred fifty-two".