202110212121 has 8 divisors (see below), whose sum is σ = 281196816960. Its totient is φ = 128881874352.

The previous prime is 202110212089. The next prime is 202110212123. The reversal of 202110212121 is 121212011202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 202110212121 - 2⁵ = 202110212089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 202110212121.

It is not an unprimeable number, because it can be changed into a prime (202110212123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1464566686 + ... + 1464566823.

It is an arithmetic number, because the mean of its divisors is an integer number (35149602120).

Almost surely, 2^202110212121 is an apocalyptic number.

It is an amenable number.

202110212121 is a deficient number, since it is larger than the sum of its proper divisors (79086604839).

202110212121 is a wasteful number, since it uses less digits than its factorization.

202110212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2929133535.

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

Adding to 202110212121 its reverse (121212011202), we get a palindrome (323322223323).

The spelling of 202110212121 in words is "two hundred two billion, one hundred ten million, two hundred twelve thousand, one hundred twenty-one".