20002100201221 has 4 divisors (see below), whose sum is σ = 20002175790912. Its totient is φ = 20002024611532.

The previous prime is 20002100201203. The next prime is 20002100201227. The reversal of 20002100201221 is 12210200120002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20002100201221 - 2⁵ = 20002100201189 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 (20002100201227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37396525 + ... + 37927618.

It is an arithmetic number, because the mean of its divisors is an integer number (5000543947728).

Almost surely, 2^{20002100201221} is an apocalyptic number.

It is an amenable number.

20002100201221 is a deficient number, since it is larger than the sum of its proper divisors (75589691).

20002100201221 is an equidigital number, since it uses as much as digits as its factorization.

20002100201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75589690.

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

Adding to 20002100201221 its reverse (12210200120002), we get a palindrome (32212300321223).

The spelling of 20002100201221 in words is "twenty trillion, two billion, one hundred million, two hundred one thousand, two hundred twenty-one".