350216721 has 24 divisors (see below), whose sum is σ = 533651040. Its totient is φ = 220708800.

The previous prime is 350216707. The next prime is 350216761. The reversal of 350216721 is 127612053.

It is a happy number.

It is not a de Polignac number, because 350216721 - 2⁵ = 350216689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (350216701) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 87126 + ... + 91056.

It is an arithmetic number, because the mean of its divisors is an integer number (22235460).

Almost surely, 2^350216721 is an apocalyptic number.

It is an amenable number.

350216721 is a deficient number, since it is larger than the sum of its proper divisors (183434319).

350216721 is a wasteful number, since it uses less digits than its factorization.

350216721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4477 (or 4474 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 350216721 is about 18714.0781498849. The cubic root of 350216721 is about 704.8753001114.

Adding to 350216721 its reverse (127612053), we get a palindrome (477828774).

The spelling of 350216721 in words is "three hundred fifty million, two hundred sixteen thousand, seven hundred twenty-one".