351664221 has 8 divisors (see below), whose sum is σ = 469032480. Its totient is φ = 234369392.

The previous prime is 351664213. The next prime is 351664253. The reversal of 351664221 is 122466153.

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 351664221 - 2³ = 351664213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (351664211) 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, 5991 + ... + 27188.

It is an arithmetic number, because the mean of its divisors is an integer number (58629060).

Almost surely, 2^351664221 is an apocalyptic number.

It is an amenable number.

351664221 is a deficient number, since it is larger than the sum of its proper divisors (117368259).

351664221 is a wasteful number, since it uses less digits than its factorization.

351664221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36715.

The product of its digits is 8640, while the sum is 30.

The square root of 351664221 is about 18752.7123638155. The cubic root of 351664221 is about 705.8450848751.

The spelling of 351664221 in words is "three hundred fifty-one million, six hundred sixty-four thousand, two hundred twenty-one".