210985056 has 72 divisors (see below), whose sum is σ = 602141904. Its totient is φ = 70076160.

The previous prime is 210985051. The next prime is 210985109. The reversal of 210985056 is 650589012.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 210985056.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210985051) 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, 90141 + ... + 92451.

It is an arithmetic number, because the mean of its divisors is an integer number (8363082).

Almost surely, 2^210985056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 210985056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (301070952).

210985056 is an abundant number, since it is smaller than the sum of its proper divisors (391156848).

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

210985056 is a wasteful number, since it uses less digits than its factorization.

210985056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2644 (or 2633 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 210985056 is about 14525.3246435321. The cubic root of 210985056 is about 595.3201262048.

The spelling of 210985056 in words is "two hundred ten million, nine hundred eighty-five thousand, fifty-six".