20200021002121 has 4 divisors (see below), whose sum is σ = 20896573450500. Its totient is φ = 19503468553744.

The previous prime is 20200021002101. The next prime is 20200021002149. The reversal of 20200021002121 is 12120012000202.

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 3884884362121 + 16315136640000 = 1971011^2 + 4039200^2 .

It is a cyclic number.

It is not a de Polignac number, because 20200021002121 - 2⁵ = 20200021002089 is a prime.

It is a super-2 number, since 2×20200021002121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20200021002101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 348276224146 + ... + 348276224203.

It is an arithmetic number, because the mean of its divisors is an integer number (5224143362625).

Almost surely, 2^{20200021002121} is an apocalyptic number.

It is an amenable number.

20200021002121 is a deficient number, since it is larger than the sum of its proper divisors (696552448379).

20200021002121 is an equidigital number, since it uses as much as digits as its factorization.

20200021002121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696552448378.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20200021002121 its reverse (12120012000202), we get a palindrome (32320033002323).

The spelling of 20200021002121 in words is "twenty trillion, two hundred billion, twenty-one million, two thousand, one hundred twenty-one".