221422493 has 4 divisors (see below), whose sum is σ = 222908700. Its totient is φ = 219936288.

The previous prime is 221422489. The next prime is 221422507. The reversal of 221422493 is 394224122.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15155449 + 206267044 = 3893^2 + 14362^2 .

It is a cyclic number.

It is not a de Polignac number, because 221422493 - 2² = 221422489 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221422423) 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, 742880 + ... + 743177.

It is an arithmetic number, because the mean of its divisors is an integer number (55727175).

Almost surely, 2^221422493 is an apocalyptic number.

It is an amenable number.

221422493 is a deficient number, since it is larger than the sum of its proper divisors (1486207).

221422493 is a wasteful number, since it uses less digits than its factorization.

221422493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1486206.

The product of its digits is 6912, while the sum is 29.

The square root of 221422493 is about 14880.2719397194. The cubic root of 221422493 is about 604.9793886838.

The spelling of 221422493 in words is "two hundred twenty-one million, four hundred twenty-two thousand, four hundred ninety-three".