2101202221 has 4 divisors (see below), whose sum is σ = 2173657500. Its totient is φ = 2028746944.

The previous prime is 2101202219. The next prime is 2101202231. The reversal of 2101202221 is 1222021012.

It is a happy number.

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 1649172100 + 452030121 = 40610^2 + 21261^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101202221 - 2¹ = 2101202219 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 (2101202231) 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, 36227596 + ... + 36227653.

It is an arithmetic number, because the mean of its divisors is an integer number (543414375).

Almost surely, 2^2101202221 is an apocalyptic number.

It is an amenable number.

2101202221 is a deficient number, since it is larger than the sum of its proper divisors (72455279).

2101202221 is an equidigital number, since it uses as much as digits as its factorization.

2101202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72455278.

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

The square root of 2101202221 is about 45838.8723792373. The cubic root of 2101202221 is about 1280.8234896652.

Adding to 2101202221 its reverse (1222021012), we get a palindrome (3323223233).

The spelling of 2101202221 in words is "two billion, one hundred one million, two hundred two thousand, two hundred twenty-one".