2101200021221 has 4 divisors (see below), whose sum is σ = 2401371452832. Its totient is φ = 1801028589612.

The previous prime is 2101200021209. The next prime is 2101200021223. The reversal of 2101200021221 is 1221200021012.

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 not a de Polignac number, because 2101200021221 - 2¹⁰ = 2101200020197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101200021196 and 2101200021205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101200021223) 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, 150085715795 + ... + 150085715808.

It is an arithmetic number, because the mean of its divisors is an integer number (600342863208).

Almost surely, 2^{2101200021221} is an apocalyptic number.

It is an amenable number.

2101200021221 is a deficient number, since it is larger than the sum of its proper divisors (300171431611).

2101200021221 is an equidigital number, since it uses as much as digits as its factorization.

2101200021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300171431610.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2101200021221 its reverse (1221200021012), we get a palindrome (3322400042233).

The spelling of 2101200021221 in words is "two trillion, one hundred one billion, two hundred million, twenty-one thousand, two hundred twenty-one".