210991890030 has 32 divisors (see below), whose sum is σ = 506544688800. Its totient is φ = 56246264832.

The previous prime is 210991890001. The next prime is 210991890037. The reversal of 210991890030 is 30098199012.

It is a super-2 number, since 2×210991890030² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210991890037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1045735 + ... + 1231074.

It is an arithmetic number, because the mean of its divisors is an integer number (15829521525).

Almost surely, 2^210991890030 is an apocalyptic number.

210991890030 is an abundant number, since it is smaller than the sum of its proper divisors (295552798770).

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

210991890030 is a wasteful number, since it uses less digits than its factorization.

210991890030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2279908.

The product of its (nonzero) digits is 34992, while the sum is 42.

The spelling of 210991890030 in words is "two hundred ten billion, nine hundred ninety-one million, eight hundred ninety thousand, thirty".