20102021122121 has 4 divisors (see below), whose sum is σ = 21284492952852. Its totient is φ = 18919549291392.

The previous prime is 20102021122063. The next prime is 20102021122187. The reversal of 20102021122121 is 12122112020102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15421808097721 + 4680213024400 = 3927061^2 + 2163380^2 .

It is a cyclic number.

It is not a de Polignac number, because 20102021122121 - 2²⁶ = 20101954013257 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 1182471830713 = 20102021122121 / (2 + 0 + 1 + 0 + 2 + 0 + 2 + 1 + 1 + 2 + 2 + 1 + 2 + 1).

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 20102021122121.

It is not an unprimeable number, because it can be changed into a prime (20102021122021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 591235915340 + ... + 591235915373.

It is an arithmetic number, because the mean of its divisors is an integer number (5321123238213).

Almost surely, 2^{20102021122121} is an apocalyptic number.

It is an amenable number.

20102021122121 is a deficient number, since it is larger than the sum of its proper divisors (1182471830731).

20102021122121 is a wasteful number, since it uses less digits than its factorization.

20102021122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1182471830730.

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

Adding to 20102021122121 its reverse (12122112020102), we get a palindrome (32224133142223).

The spelling of 20102021122121 in words is "twenty trillion, one hundred two billion, twenty-one million, one hundred twenty-two thousand, one hundred twenty-one".