200021220120021 has 16 divisors (see below), whose sum is σ = 278290744129536. Its totient is φ = 127549602716976.

The previous prime is 200021220120017. The next prime is 200021220120047. The reversal of 200021220120021 is 120021022120002.

It is not a de Polignac number, because 200021220120021 - 2² = 200021220120017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200021220120011) 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, 79010736 + ... + 81502998.

It is an arithmetic number, because the mean of its divisors is an integer number (17393171508096).

Almost surely, 2^{200021220120021} is an apocalyptic number.

It is an amenable number.

200021220120021 is a deficient number, since it is larger than the sum of its proper divisors (78269524009515).

200021220120021 is a wasteful number, since it uses less digits than its factorization.

200021220120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3655432.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 200021220120021 its reverse (120021022120002), we get a palindrome (320042242240023).

The spelling of 200021220120021 in words is "two hundred trillion, twenty-one billion, two hundred twenty million, one hundred twenty thousand, twenty-one".