210121221213 has 6 divisors (see below), whose sum is σ = 303508430654. Its totient is φ = 140080814136.

The previous prime is 210121221203. The next prime is 210121221227. The reversal of 210121221213 is 312122121012.

210121221213 is a `hidden beast` number, since 210 + 1 + 21 + 221 + 213 = 666.

210121221213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 134013102084 + 76108119129 = 366078^2 + 275877^2 .

It is not a de Polignac number, because 210121221213 - 2²⁶ = 210054112349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210121221203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11673401170 + ... + 11673401187.

Almost surely, 2^210121221213 is an apocalyptic number.

It is an amenable number.

210121221213 is a deficient number, since it is larger than the sum of its proper divisors (93387209441).

210121221213 is a wasteful number, since it uses less digits than its factorization.

210121221213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23346802363 (or 23346802360 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 210121221213 its reverse (312122121012), we get a palindrome (522243342225).

The spelling of 210121221213 in words is "two hundred ten billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred thirteen".