210561996 has 48 divisors (see below), whose sum is σ = 502467840. Its totient is φ = 68608320.

The previous prime is 210561991. The next prime is 210562007. The reversal of 210561996 is 699165012.

It is not an unprimeable number, because it can be changed into a prime (210561991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130225 + ... + 131831.

It is an arithmetic number, because the mean of its divisors is an integer number (10468080).

Almost surely, 2^210561996 is an apocalyptic number.

It is an amenable number.

210561996 is an abundant number, since it is smaller than the sum of its proper divisors (291905844).

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

210561996 is a wasteful number, since it uses less digits than its factorization.

210561996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1854 (or 1852 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 39.

The square root of 210561996 is about 14510.7544945120. The cubic root of 210561996 is about 594.9219547847.

The spelling of 210561996 in words is "two hundred ten million, five hundred sixty-one thousand, nine hundred ninety-six".