331201121021 has 2 divisors, whose sum is σ = 331201121022. Its totient is φ = 331201121020.

The previous prime is 331201120979. The next prime is 331201121023. The reversal of 331201121021 is 120121102133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 327928022500 + 3273098521 = 572650^2 + 57211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331201121021 is a prime.

Together with 331201121023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331201121023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165600560510 + 165600560511.

It is an arithmetic number, because the mean of its divisors is an integer number (165600560511).

Almost surely, 2^331201121021 is an apocalyptic number.

It is an amenable number.

331201121021 is a deficient number, since it is larger than the sum of its proper divisors (1).

331201121021 is an equidigital number, since it uses as much as digits as its factorization.

331201121021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 331201121021 its reverse (120121102133), we get a palindrome (451322223154).

The spelling of 331201121021 in words is "three hundred thirty-one billion, two hundred one million, one hundred twenty-one thousand, twenty-one".