3213101312221 has 4 divisors (see below), whose sum is σ = 3213107823772. Its totient is φ = 3213094800672.

The previous prime is 3213101312177. The next prime is 3213101312243. The reversal of 3213101312221 is 1222131013123.

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 1737095004121 + 1476006308100 = 1317989^2 + 1214910^2 .

It is a cyclic number.

It is not a de Polignac number, because 3213101312221 - 2⁷ = 3213101312093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3213101312192 and 3213101312201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3213101312251) 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, 2448960 + ... + 3524713.

It is an arithmetic number, because the mean of its divisors is an integer number (803276955943).

Almost surely, 2^{3213101312221} is an apocalyptic number.

It is an amenable number.

3213101312221 is a deficient number, since it is larger than the sum of its proper divisors (6511551).

3213101312221 is an equidigital number, since it uses as much as digits as its factorization.

3213101312221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6511550.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 3213101312221 its reverse (1222131013123), we get a palindrome (4435232325344).

The spelling of 3213101312221 in words is "three trillion, two hundred thirteen billion, one hundred one million, three hundred twelve thousand, two hundred twenty-one".