3102212221 has 4 divisors (see below), whose sum is σ = 3104903932. Its totient is φ = 3099520512.

The previous prime is 3102212219. The next prime is 3102212231. The reversal of 3102212221 is 1222122013.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1222122013 = 7 ⋅174588859.

It can be written as a sum of positive squares in 2 ways, for example, as 1948251321 + 1153960900 = 44139^2 + 33970^2 .

It is a cyclic number.

It is not a de Polignac number, because 3102212221 - 2¹ = 3102212219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3102212195 and 3102212204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3102212231) 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, 1344126 + ... + 1346431.

It is an arithmetic number, because the mean of its divisors is an integer number (776225983).

Almost surely, 2^3102212221 is an apocalyptic number.

It is an amenable number.

3102212221 is a deficient number, since it is larger than the sum of its proper divisors (2691711).

3102212221 is a wasteful number, since it uses less digits than its factorization.

3102212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2691710.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 3102212221 is about 55697.5064163558. The cubic root of 3102212221 is about 1458.4464962425.

Adding to 3102212221 its reverse (1222122013), we get a palindrome (4324334234).

The spelling of 3102212221 in words is "three billion, one hundred two million, two hundred twelve thousand, two hundred twenty-one".