3121123203221 has 2 divisors, whose sum is σ = 3121123203222. Its totient is φ = 3121123203220.

The previous prime is 3121123203127. The next prime is 3121123203277. The reversal of 3121123203221 is 1223023211213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3059049972196 + 62073231025 = 1749014^2 + 249145^2 .

It is a cyclic number.

It is not a de Polignac number, because 3121123203221 - 2¹⁸ = 3121122941077 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3121123208221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1560561601610 + 1560561601611.

It is an arithmetic number, because the mean of its divisors is an integer number (1560561601611).

Almost surely, 2^{3121123203221} is an apocalyptic number.

It is an amenable number.

3121123203221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3121123203221 is an equidigital number, since it uses as much as digits as its factorization.

3121123203221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 3121123203221 its reverse (1223023211213), we get a palindrome (4344146414434).

The spelling of 3121123203221 in words is "three trillion, one hundred twenty-one billion, one hundred twenty-three million, two hundred three thousand, two hundred twenty-one".