210221121101212 has 96 divisors (see below), whose sum is σ = 399880021020480. Its totient is φ = 96123064227840.

The previous prime is 210221121101209. The next prime is 210221121101219. The reversal of 210221121101212 is 212101121122012.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 210221121101212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210221121101219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13965389478 + ... + 13965404530.

It is an arithmetic number, because the mean of its divisors is an integer number (4165416885630).

Almost surely, 2^{210221121101212} is an apocalyptic number.

It is an amenable number.

210221121101212 is a deficient number, since it is larger than the sum of its proper divisors (189658899919268).

210221121101212 is a wasteful number, since it uses less digits than its factorization.

210221121101212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18503 (or 18501 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 210221121101212 its reverse (212101121122012), we get a palindrome (422322242223224).

The spelling of 210221121101212 in words is "two hundred ten trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred one thousand, two hundred twelve".