2102001011221 has 4 divisors (see below), whose sum is σ = 2150884755712. Its totient is φ = 2053117266732.

The previous prime is 2102001011179. The next prime is 2102001011263. The reversal of 2102001011221 is 1221101002012.

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 an interprime number because it is at equal distance from previous prime (2102001011179) and next prime (2102001011263).

It is a cyclic number.

It is not a de Polignac number, because 2102001011221 - 2⁷ = 2102001011093 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 (2102001011281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24441872181 + ... + 24441872266.

It is an arithmetic number, because the mean of its divisors is an integer number (537721188928).

Almost surely, 2^{2102001011221} is an apocalyptic number.

It is an amenable number.

2102001011221 is a deficient number, since it is larger than the sum of its proper divisors (48883744491).

2102001011221 is an equidigital number, since it uses as much as digits as its factorization.

2102001011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48883744490.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2102001011221 its reverse (1221101002012), we get a palindrome (3323102013233).

The spelling of 2102001011221 in words is "two trillion, one hundred two billion, one million, eleven thousand, two hundred twenty-one".