2102221021 has 4 divisors (see below), whose sum is σ = 2104892992. Its totient is φ = 2099549052.

The previous prime is 2102221013. The next prime is 2102221103. The reversal of 2102221021 is 1201222012.

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 2102221021 - 2³ = 2102221013 is a prime.

It is a super-2 number, since 2×2102221021² = 8838666442268564882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2102220992 and 2102221010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102221421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1334805 + ... + 1336378.

It is an arithmetic number, because the mean of its divisors is an integer number (526223248).

Almost surely, 2^2102221021 is an apocalyptic number.

It is an amenable number.

2102221021 is a deficient number, since it is larger than the sum of its proper divisors (2671971).

2102221021 is an equidigital number, since it uses as much as digits as its factorization.

2102221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2671970.

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

The square root of 2102221021 is about 45849.9838713167. The cubic root of 2102221021 is about 1281.0304651630.

Adding to 2102221021 its reverse (1201222012), we get a palindrome (3303443033).

Subtracting from 2102221021 its reverse (1201222012), we obtain a palindrome (900999009).

The spelling of 2102221021 in words is "two billion, one hundred two million, two hundred twenty-one thousand, twenty-one".