3212121302221 has 4 divisors (see below), whose sum is σ = 3459207556252. Its totient is φ = 2965035048192.

The previous prime is 3212121302209. The next prime is 3212121302239. The reversal of 3212121302221 is 1222031212123.

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 1092054260196 + 2120067042025 = 1045014^2 + 1456045^2 .

It is a cyclic number.

It is not a de Polignac number, because 3212121302221 - 2⁵ = 3212121302189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3212121302192 and 3212121302201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3212121302281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123543126996 + ... + 123543127021.

It is an arithmetic number, because the mean of its divisors is an integer number (864801889063).

Almost surely, 2^{3212121302221} is an apocalyptic number.

It is an amenable number.

3212121302221 is a deficient number, since it is larger than the sum of its proper divisors (247086254031).

3212121302221 is a wasteful number, since it uses less digits than its factorization.

3212121302221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247086254030.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 3212121302221 its reverse (1222031212123), we get a palindrome (4434152514344).

The spelling of 3212121302221 in words is "three trillion, two hundred twelve billion, one hundred twenty-one million, three hundred two thousand, two hundred twenty-one".