202121102121 has 16 divisors (see below), whose sum is σ = 275884164864. Its totient is φ = 131555494224.

The previous prime is 202121102111. The next prime is 202121102129. The reversal of 202121102121 is 121201121202.

It is not a de Polignac number, because 202121102121 - 2⁷ = 202121101993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 202121102121.

It is not an unprimeable number, because it can be changed into a prime (202121102129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53131 + ... + 638016.

It is an arithmetic number, because the mean of its divisors is an integer number (17242760304).

Almost surely, 2^202121102121 is an apocalyptic number.

It is an amenable number.

202121102121 is a deficient number, since it is larger than the sum of its proper divisors (73763062743).

202121102121 is a wasteful number, since it uses less digits than its factorization.

202121102121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693460.

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

Adding to 202121102121 its reverse (121201121202), we get a palindrome (323322223323).

The spelling of 202121102121 in words is "two hundred two billion, one hundred twenty-one million, one hundred two thousand, one hundred twenty-one".