303212221 has 16 divisors (see below), whose sum is σ = 353795904. Its totient is φ = 257289984.

The previous prime is 303212171. The next prime is 303212251. The reversal of 303212221 is 122212303.

It is not a de Polignac number, because 303212221 - 2¹⁵ = 303179453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 303212195 and 303212204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (303212251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6451 + ... + 25456.

It is an arithmetic number, because the mean of its divisors is an integer number (22112244).

Almost surely, 2^303212221 is an apocalyptic number.

It is an amenable number.

303212221 is a deficient number, since it is larger than the sum of its proper divisors (50583683).

303212221 is a wasteful number, since it uses less digits than its factorization.

303212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31980.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 303212221 is about 17412.9900074628. The cubic root of 303212221 is about 671.8137689315.

Adding to 303212221 its reverse (122212303), we get a palindrome (425424524).

The spelling of 303212221 in words is "three hundred three million, two hundred twelve thousand, two hundred twenty-one".