2110221221 has 6 divisors (see below), whose sum is σ = 2185497522. Its totient is φ = 2037454160.

The previous prime is 2110221209. The next prime is 2110221233. The reversal of 2110221221 is 1221220112.

It is an interprime number because it is at equal distance from previous prime (2110221209) and next prime (2110221233).

It can be written as a sum of positive squares in 3 ways, for example, as 591170596 + 1519050625 = 24314^2 + 38975^2 .

It is not a de Polignac number, because 2110221221 - 2²² = 2106026917 is a prime.

It is a super-4 number, since 4×2110221221⁴ (a number of 38 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2110221196 and 2110221205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2110221241) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1253750 + ... + 1255431.

It is an arithmetic number, because the mean of its divisors is an integer number (364249587).

Almost surely, 2^2110221221 is an apocalyptic number.

It is an amenable number.

2110221221 is a deficient number, since it is larger than the sum of its proper divisors (75276301).

2110221221 is an equidigital number, since it uses as much as digits as its factorization.

2110221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2509239 (or 2509210 counting only the distinct ones).

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

The square root of 2110221221 is about 45937.1442407993. The cubic root of 2110221221 is about 1282.6534354562.

Adding to 2110221221 its reverse (1221220112), we get a palindrome (3331441333).

The spelling of 2110221221 in words is "two billion, one hundred ten million, two hundred twenty-one thousand, two hundred twenty-one".