2157209850 has 24 divisors (see below), whose sum is σ = 5349880800. Its totient is φ = 575255920.

The previous prime is 2157209837. The next prime is 2157209851. The reversal of 2157209850 is 589027512.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2157209799 and 2157209808.

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 11 ways as a sum of consecutive naturals, for example, 7190550 + ... + 7190849.

It is an arithmetic number, because the mean of its divisors is an integer number (222911700).

Almost surely, 2^2157209850 is an apocalyptic number.

2157209850 is an abundant number, since it is smaller than the sum of its proper divisors (3192670950).

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

2157209850 is a wasteful number, since it uses less digits than its factorization.

2157209850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14381414 (or 14381409 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 39.

The square root of 2157209850 is about 46445.7732199605. The cubic root of 2157209850 is about 1292.1039819726.

The spelling of 2157209850 in words is "two billion, one hundred fifty-seven million, two hundred nine thousand, eight hundred fifty".