351012221 has 8 divisors (see below), whose sum is σ = 404086080. Its totient is φ = 298670688.

The previous prime is 351012217. The next prime is 351012253. The reversal of 351012221 is 122210153.

It is a happy number.

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 351012221 - 2² = 351012217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 351012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (351012271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182051 + ... + 183968.

It is an arithmetic number, because the mean of its divisors is an integer number (50510760).

Almost surely, 2^351012221 is an apocalyptic number.

It is an amenable number.

351012221 is a deficient number, since it is larger than the sum of its proper divisors (53073859).

351012221 is a wasteful number, since it uses less digits than its factorization.

351012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366163.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 351012221 is about 18735.3201467175. The cubic root of 351012221 is about 705.4085930193.

Adding to 351012221 its reverse (122210153), we get a palindrome (473222374).

The spelling of 351012221 in words is "three hundred fifty-one million, twelve thousand, two hundred twenty-one".