202111021012121 has 8 divisors (see below), whose sum is σ = 217725597346824. Its totient is φ = 186506098208640.

The previous prime is 202111021012081. The next prime is 202111021012123. The reversal of 202111021012121 is 121210120111202.

It can be written as a sum of positive squares in 4 ways, for example, as 72838782670096 + 129272238342025 = 8534564^2 + 11369795^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 202111021012121 - 2⁴² = 197712974501017 is a prime.

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 202111021012121.

It is not an unprimeable number, because it can be changed into a prime (202111021012123) 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, 2413339316 + ... + 2413423061.

It is an arithmetic number, because the mean of its divisors is an integer number (27215699668353).

Almost surely, 2^{202111021012121} is an apocalyptic number.

It is an amenable number.

202111021012121 is a deficient number, since it is larger than the sum of its proper divisors (15614576334703).

202111021012121 is a wasteful number, since it uses less digits than its factorization.

202111021012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4826765611.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 202111021012121 its reverse (121210120111202), we get a palindrome (323321141123323).

The spelling of 202111021012121 in words is "two hundred two trillion, one hundred eleven billion, twenty-one million, twelve thousand, one hundred twenty-one".