20202120121021 has 8 divisors (see below), whose sum is σ = 20446214199840. Its totient is φ = 19959094288368.

The previous prime is 20202120121019. The next prime is 20202120121039. The reversal of 20202120121021 is 12012102120202.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20202120121021 - 2¹ = 20202120121019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20202120120986 and 20202120121004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20202120121621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 267023491 + ... + 267099136.

It is an arithmetic number, because the mean of its divisors is an integer number (2555776774980).

Almost surely, 2^{20202120121021} is an apocalyptic number.

It is an amenable number.

20202120121021 is a deficient number, since it is larger than the sum of its proper divisors (244094078819).

20202120121021 is a wasteful number, since it uses less digits than its factorization.

20202120121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534123083.

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

Adding to 20202120121021 its reverse (12012102120202), we get a palindrome (32214222241223).

It can be divided in two parts, 20202 and 120121021, that multiplied together give a palindrome (2426684866242).

The spelling of 20202120121021 in words is "twenty trillion, two hundred two billion, one hundred twenty million, one hundred twenty-one thousand, twenty-one".