202021102120121 has 4 divisors (see below), whose sum is σ = 202022166884352. Its totient is φ = 202020037355892.

The previous prime is 202021102120099. The next prime is 202021102120133. The reversal of 202021102120121 is 121021201120202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 202021102120121 - 2¹⁸ = 202021101857977 is a prime.

It is a super-2 number, since 2×202021102120121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 202021102120121.

It is not an unprimeable number, because it can be changed into a prime (202021102128121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 532097465 + ... + 532476998.

It is an arithmetic number, because the mean of its divisors is an integer number (50505541721088).

Almost surely, 2^{202021102120121} is an apocalyptic number.

It is an amenable number.

202021102120121 is a deficient number, since it is larger than the sum of its proper divisors (1064764231).

202021102120121 is a wasteful number, since it uses less digits than its factorization.

202021102120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1064764230.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 202021102120121 its reverse (121021201120202), we get a palindrome (323042303240323).

The spelling of 202021102120121 in words is "two hundred two trillion, twenty-one billion, one hundred two million, one hundred twenty thousand, one hundred twenty-one".