20020121021021 has 32 divisors (see below), whose sum is σ = 22139596512000. Its totient is φ = 17952674688000.

The previous prime is 20020121020973. The next prime is 20020121021029. The reversal of 20020121021021 is 12012012102002.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20020121021021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20020121020987 and 20020121021005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020121021029) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 141734051 + ... + 141875231.

It is an arithmetic number, because the mean of its divisors is an integer number (691862391000).

Almost surely, 2^{20020121021021} is an apocalyptic number.

It is an amenable number.

20020121021021 is a deficient number, since it is larger than the sum of its proper divisors (2119475490979).

20020121021021 is a wasteful number, since it uses less digits than its factorization.

20020121021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141941.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20020121021021 its reverse (12012012102002), we get a palindrome (32032133123023).

The spelling of 20020121021021 in words is "twenty trillion, twenty billion, one hundred twenty-one million, twenty-one thousand, twenty-one".