331402100221 has 4 divisors (see below), whose sum is σ = 331460236444. Its totient is φ = 331343964000.

The previous prime is 331402100207. The next prime is 331402100233. The reversal of 331402100221 is 122001204133.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122001204133 = 19 ⋅6421116007.

It can be written as a sum of positive squares in 2 ways, for example, as 169686324900 + 161715775321 = 411930^2 + 402139^2 .

It is a cyclic number.

It is not a de Polignac number, because 331402100221 - 2⁵ = 331402100189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331402100521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29059560 + ... + 29070961.

It is an arithmetic number, because the mean of its divisors is an integer number (82865059111).

Almost surely, 2^331402100221 is an apocalyptic number.

It is an amenable number.

331402100221 is a deficient number, since it is larger than the sum of its proper divisors (58136223).

331402100221 is an equidigital number, since it uses as much as digits as its factorization.

331402100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58136222.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 331402100221 its reverse (122001204133), we get a palindrome (453403304354).

The spelling of 331402100221 in words is "three hundred thirty-one billion, four hundred two million, one hundred thousand, two hundred twenty-one".