222381721 has 4 divisors (see below), whose sum is σ = 222587392. Its totient is φ = 222176052.

The previous prime is 222381713. The next prime is 222381739. The reversal of 222381721 is 127183222.

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.

It is a cyclic number.

It is not a de Polignac number, because 222381721 - 2³ = 222381713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 222381721.

It is not an unprimeable number, because it can be changed into a prime (222381751) 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, 101205 + ... + 103378.

It is an arithmetic number, because the mean of its divisors is an integer number (55646848).

Almost surely, 2^222381721 is an apocalyptic number.

It is an amenable number.

222381721 is a deficient number, since it is larger than the sum of its proper divisors (205671).

222381721 is a wasteful number, since it uses less digits than its factorization.

222381721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205670.

The product of its digits is 2688, while the sum is 28.

The square root of 222381721 is about 14912.4686420458. The cubic root of 222381721 is about 605.8517438775.

The spelling of 222381721 in words is "two hundred twenty-two million, three hundred eighty-one thousand, seven hundred twenty-one".