201020202112121 has 12 divisors (see below), whose sum is σ = 233850672670032. Its totient is φ = 172295038796328.

The previous prime is 201020202112043. The next prime is 201020202112127. The reversal of 201020202112121 is 121211202020102.

It is not a de Polignac number, because 201020202112121 - 2²² = 201020197917817 is a prime.

It is a super-2 number, since 2×201020202112121² (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 201020202112121.

It is not an unprimeable number, because it can be changed into a prime (201020202112127) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 94070555 + ... + 96183728.

It is an arithmetic number, because the mean of its divisors is an integer number (19487556055836).

Almost surely, 2^{201020202112121} is an apocalyptic number.

It is an amenable number.

201020202112121 is a deficient number, since it is larger than the sum of its proper divisors (32830470557911).

201020202112121 is a wasteful number, since it uses less digits than its factorization.

201020202112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190275860 (or 190275853 counting only the distinct ones).

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

Adding to 201020202112121 its reverse (121211202020102), we get a palindrome (322231404132223).

The spelling of 201020202112121 in words is "two hundred one trillion, twenty billion, two hundred two million, one hundred twelve thousand, one hundred twenty-one".