202021200021 has 16 divisors (see below), whose sum is σ = 276683897600. Its totient is φ = 131020763328.

The previous prime is 202021200013. The next prime is 202021200067. The reversal of 202021200021 is 120002120202.

It is not a de Polignac number, because 202021200021 - 2³ = 202021200013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202021200721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 609060 + ... + 880338.

It is an arithmetic number, because the mean of its divisors is an integer number (17292743600).

Almost surely, 2^202021200021 is an apocalyptic number.

It is an amenable number.

202021200021 is a deficient number, since it is larger than the sum of its proper divisors (74662697579).

202021200021 is a wasteful number, since it uses less digits than its factorization.

202021200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278028.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 202021200021 its reverse (120002120202), we get a palindrome (322023320223).

It can be divided in two parts, 20202 and 1200021, that multiplied together give a palindrome (24242824242).

The spelling of 202021200021 in words is "two hundred two billion, twenty-one million, two hundred thousand, twenty-one".