2102144221 has 4 divisors (see below), whose sum is σ = 2102274972. Its totient is φ = 2102013472.

The previous prime is 2102144207. The next prime is 2102144267. The reversal of 2102144221 is 1224412012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1087020900 + 1015123321 = 32970^2 + 31861^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102144221 - 2²⁹ = 1565273309 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 (2102144321) 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, 37216 + ... + 74761.

It is an arithmetic number, because the mean of its divisors is an integer number (525568743).

Almost surely, 2^2102144221 is an apocalyptic number.

It is an amenable number.

2102144221 is a deficient number, since it is larger than the sum of its proper divisors (130751).

2102144221 is a wasteful number, since it uses less digits than its factorization.

2102144221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130750.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 2102144221 is about 45849.1463497413. The cubic root of 2102144221 is about 1281.0148651006.

Adding to 2102144221 its reverse (1224412012), we get a palindrome (3326556233).

The spelling of 2102144221 in words is "two billion, one hundred two million, one hundred forty-four thousand, two hundred twenty-one".