20212010122121 has 4 divisors (see below), whose sum is σ = 20267083719552. Its totient is φ = 20156936524692.

The previous prime is 20212010122111. The next prime is 20212010122123. The reversal of 20212010122121 is 12122101021202.

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 20212010122121 - 2²⁶ = 20211943013257 is a prime.

It is a super-2 number, since 2×20212010122121² (a number of 27 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 20212010122121.

It is not an unprimeable number, because it can be changed into a prime (20212010122123) 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, 27536798165 + ... + 27536798898.

It is an arithmetic number, because the mean of its divisors is an integer number (5066770929888).

Almost surely, 2^{20212010122121} is an apocalyptic number.

It is an amenable number.

20212010122121 is a deficient number, since it is larger than the sum of its proper divisors (55073597431).

20212010122121 is an equidigital number, since it uses as much as digits as its factorization.

20212010122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55073597430.

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

Adding to 20212010122121 its reverse (12122101021202), we get a palindrome (32334111143323).

The spelling of 20212010122121 in words is "twenty trillion, two hundred twelve billion, ten million, one hundred twenty-two thousand, one hundred twenty-one".