351240401221 has 8 divisors (see below), whose sum is σ = 353931147000. Its totient is φ = 348554101440.

The previous prime is 351240401167. The next prime is 351240401231. The reversal of 351240401221 is 122104042153.

It can be written as a sum of positive squares in 4 ways, for example, as 95092056900 + 256148344321 = 308370^2 + 506111^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 351240401221 - 2⁷ = 351240401093 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 (351240401231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 952806 + ... + 1268983.

It is an arithmetic number, because the mean of its divisors is an integer number (44241393375).

Almost surely, 2^351240401221 is an apocalyptic number.

It is an amenable number.

351240401221 is a deficient number, since it is larger than the sum of its proper divisors (2690745779).

351240401221 is a wasteful number, since it uses less digits than its factorization.

351240401221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2222999.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 351240401221 its reverse (122104042153), we get a palindrome (473344443374).

The spelling of 351240401221 in words is "three hundred fifty-one billion, two hundred forty million, four hundred one thousand, two hundred twenty-one".