210121220102212 has 6 divisors (see below), whose sum is σ = 367712135178878. Its totient is φ = 105060610051104.

The previous prime is 210121220102179. The next prime is 210121220102219. The reversal of 210121220102212 is 212201022121012.

It can be written as a sum of positive squares in only one way, i.e., 205754524469316 + 4366695632896 = 14344146^2 + 2089664^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 210121220102212.

It is not an unprimeable number, because it can be changed into a prime (210121220102219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26265152512773 + ... + 26265152512780.

Almost surely, 2^{210121220102212} is an apocalyptic number.

It is an amenable number.

210121220102212 is a deficient number, since it is larger than the sum of its proper divisors (157590915076666).

210121220102212 is a wasteful number, since it uses less digits than its factorization.

210121220102212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52530305025557 (or 52530305025555 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 210121220102212 its reverse (212201022121012), we get a palindrome (422322242223224).

The spelling of 210121220102212 in words is "two hundred ten trillion, one hundred twenty-one billion, two hundred twenty million, one hundred two thousand, two hundred twelve".