210221121210 has 64 divisors (see below), whose sum is σ = 506839348224. Its totient is φ = 55802649600.

The previous prime is 210221121199. The next prime is 210221121239. The reversal of 210221121210 is 12121122012.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 210221121210.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22892820 + ... + 22902000.

It is an arithmetic number, because the mean of its divisors is an integer number (7919364816).

Almost surely, 2^210221121210 is an apocalyptic number.

210221121210 is an abundant number, since it is smaller than the sum of its proper divisors (296618227014).

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

210221121210 is a wasteful number, since it uses less digits than its factorization.

210221121210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12599.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 210221121210 its reverse (12121122012), we get a palindrome (222342243222).

The spelling of 210221121210 in words is "two hundred ten billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred ten".