331221220210001 has 6 divisors (see below), whose sum is σ = 364069605685506. Its totient is φ = 301110200190800.

The previous prime is 331221220209977. The next prime is 331221220210007. The reversal of 331221220210001 is 100012022122133.

It can be written as a sum of positive squares in only one way, i.e., 331205384504401 + 15835705600 = 18199049^2 + 125840^2 .

It is a de Polignac number, because none of the positive numbers 2^k-331221220210001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (331221220210007) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1368682728020 + ... + 1368682728261.

It is an arithmetic number, because the mean of its divisors is an integer number (60678267614251).

Almost surely, 2^{331221220210001} is an apocalyptic number.

It is an amenable number.

331221220210001 is a deficient number, since it is larger than the sum of its proper divisors (32848385475505).

331221220210001 is a wasteful number, since it uses less digits than its factorization.

331221220210001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2737365456303 (or 2737365456292 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 331221220210001 its reverse (100012022122133), we get a palindrome (431233242332134).

The spelling of 331221220210001 in words is "three hundred thirty-one trillion, two hundred twenty-one billion, two hundred twenty million, two hundred ten thousand, one".