373217221 has 4 divisors (see below), whose sum is σ = 401926252. Its totient is φ = 344508192.

The previous prime is 373217213. The next prime is 373217231. The reversal of 373217221 is 122712373.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122712373 = 7 ⋅17530339.

It can be written as a sum of positive squares in 2 ways, for example, as 62964225 + 310252996 = 7935^2 + 17614^2 .

It is a cyclic number.

It is not a de Polignac number, because 373217221 - 2³ = 373217213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 373217221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (373217231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14354496 + ... + 14354521.

It is an arithmetic number, because the mean of its divisors is an integer number (100481563).

Almost surely, 2^373217221 is an apocalyptic number.

It is an amenable number.

373217221 is a deficient number, since it is larger than the sum of its proper divisors (28709031).

373217221 is a wasteful number, since it uses less digits than its factorization.

373217221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28709030.

The product of its digits is 3528, while the sum is 28.

The square root of 373217221 is about 19318.8307358391. The cubic root of 373217221 is about 719.9802084323.

Adding to 373217221 its reverse (122712373), we get a palindrome (495929594).

The spelling of 373217221 in words is "three hundred seventy-three million, two hundred seventeen thousand, two hundred twenty-one".