210972840 has 192 divisors, whose sum is σ = 698855040. Its totient is φ = 50918400.

The previous prime is 210972829. The next prime is 210972851. The reversal of 210972840 is 48279012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (210972829) and next prime (210972851).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2048229 + ... + 2048331.

It is an arithmetic number, because the mean of its divisors is an integer number (3639870).

Almost surely, 2^210972840 is an apocalyptic number.

210972840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 210972840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (349427520).

210972840 is an abundant number, since it is smaller than the sum of its proper divisors (487882200).

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

210972840 is a wasteful number, since it uses less digits than its factorization.

210972840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244 (or 227 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 210972840 is about 14524.9041304926. The cubic root of 210972840 is about 595.3086363373.

The spelling of 210972840 in words is "two hundred ten million, nine hundred seventy-two thousand, eight hundred forty".