222894721 has 4 divisors (see below), whose sum is σ = 254736832. Its totient is φ = 191052612.

The previous prime is 222894713. The next prime is 222894731. The reversal of 222894721 is 127498222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 127498222 = 2 ⋅63749111.

It is a cyclic number.

It is not a de Polignac number, because 222894721 - 2³ = 222894713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (222894731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15921045 + ... + 15921058.

It is an arithmetic number, because the mean of its divisors is an integer number (63684208).

Almost surely, 2^222894721 is an apocalyptic number.

It is an amenable number.

222894721 is a deficient number, since it is larger than the sum of its proper divisors (31842111).

222894721 is an equidigital number, since it uses as much as digits as its factorization.

222894721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31842110.

The product of its digits is 32256, while the sum is 37.

The square root of 222894721 is about 14929.6591052844. The cubic root of 222894721 is about 606.3172546495.

The spelling of 222894721 in words is "two hundred twenty-two million, eight hundred ninety-four thousand, seven hundred twenty-one".