2021120120021 has 24 divisors (see below), whose sum is σ = 2230392780000. Its totient is φ = 1826244569952.

The previous prime is 2021120120017. The next prime is 2021120120069. The reversal of 2021120120021 is 1200210211202.

It is not a de Polignac number, because 2021120120021 - 2² = 2021120120017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021120119978 and 2021120120005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021120120521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3219710 + ... + 3795888.

It is an arithmetic number, because the mean of its divisors is an integer number (92933032500).

Almost surely, 2^{2021120120021} is an apocalyptic number.

It is an amenable number.

2021120120021 is a deficient number, since it is larger than the sum of its proper divisors (209272659979).

2021120120021 is a wasteful number, since it uses less digits than its factorization.

2021120120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576593 (or 576570 counting only the distinct ones).

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

Adding to 2021120120021 its reverse (1200210211202), we get a palindrome (3221330331223).

The spelling of 2021120120021 in words is "two trillion, twenty-one billion, one hundred twenty million, one hundred twenty thousand, twenty-one".