331201211020021 has 2 divisors, whose sum is σ = 331201211020022. Its totient is φ = 331201211020020.

The previous prime is 331201211019967. The next prime is 331201211020093. The reversal of 331201211020021 is 120020112102133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 278468851512996 + 52732359507025 = 16687386^2 + 7261705^2 .

It is a cyclic number.

It is not a de Polignac number, because 331201211020021 - 2¹¹ = 331201211017973 is a prime.

It is a super-2 number, since 2×331201211020021² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331201211020621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165600605510010 + 165600605510011.

It is an arithmetic number, because the mean of its divisors is an integer number (165600605510011).

Almost surely, 2^{331201211020021} is an apocalyptic number.

It is an amenable number.

331201211020021 is a deficient number, since it is larger than the sum of its proper divisors (1).

331201211020021 is an equidigital number, since it uses as much as digits as its factorization.

331201211020021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 331201211020021 its reverse (120020112102133), we get a palindrome (451221323122154).

The spelling of 331201211020021 in words is "three hundred thirty-one trillion, two hundred one billion, two hundred eleven million, twenty thousand, twenty-one".