20020012121 has 4 divisors (see below), whose sum is σ = 20063252352. Its totient is φ = 19976771892.

The previous prime is 20020012109. The next prime is 20020012171. The reversal of 20020012121 is 12121002002.

It is a happy number.

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 20020012121 - 2³⁰ = 18946270297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20020012171) 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, 21619421 + ... + 21620346.

It is an arithmetic number, because the mean of its divisors is an integer number (5015813088).

Almost surely, 2^20020012121 is an apocalyptic number.

It is an amenable number.

20020012121 is a deficient number, since it is larger than the sum of its proper divisors (43240231).

20020012121 is an equidigital number, since it uses as much as digits as its factorization.

20020012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43240230.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20020012121 its reverse (12121002002), we get a palindrome (32141014123).

The spelling of 20020012121 in words is "twenty billion, twenty million, twelve thousand, one hundred twenty-one".