921218222 has 4 divisors (see below), whose sum is σ = 1381827336. Its totient is φ = 460609110.

The previous prime is 921218201. The next prime is 921218251. The reversal of 921218222 is 222812129.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 230304554 + ... + 230304557.

It is an arithmetic number, because the mean of its divisors is an integer number (345456834).

Almost surely, 2^921218222 is an apocalyptic number.

921218222 is a deficient number, since it is larger than the sum of its proper divisors (460609114).

921218222 is a wasteful number, since it uses less digits than its factorization.

921218222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460609113.

The product of its digits is 2304, while the sum is 29.

The square root of 921218222 is about 30351.5769277314. The cubic root of 921218222 is about 973.0179227855.

The spelling of 921218222 in words is "nine hundred twenty-one million, two hundred eighteen thousand, two hundred twenty-two".