20020021122121 has 4 divisors (see below), whose sum is σ = 20021479364500. Its totient is φ = 20018562879744.

The previous prime is 20020021122071. The next prime is 20020021122131. The reversal of 20020021122121 is 12122112002002.

It is a happy number.

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 7751569178896 + 12268451943225 = 2784164^2 + 3502635^2 .

It is a cyclic number.

It is not a de Polignac number, because 20020021122121 - 2⁷ = 20020021121993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20020021122095 and 20020021122104.

It is not an unprimeable number, because it can be changed into a prime (20020021122131) 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, 729100596 + ... + 729128053.

It is an arithmetic number, because the mean of its divisors is an integer number (5005369841125).

Almost surely, 2^{20020021122121} is an apocalyptic number.

It is an amenable number.

20020021122121 is a deficient number, since it is larger than the sum of its proper divisors (1458242379).

20020021122121 is a wasteful number, since it uses less digits than its factorization.

20020021122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458242378.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20020021122121 its reverse (12122112002002), we get a palindrome (32142133124123).

The spelling of 20020021122121 in words is "twenty trillion, twenty billion, twenty-one million, one hundred twenty-two thousand, one hundred twenty-one".