222646421 has 8 divisors (see below), whose sum is σ = 227060064. Its totient is φ = 218274160.

The previous prime is 222646409. The next prime is 222646439. The reversal of 222646421 is 124646222.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 222646421 - 2⁶ = 222646357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222646121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 635 + ... + 21111.

It is an arithmetic number, because the mean of its divisors is an integer number (28382508).

Almost surely, 2^222646421 is an apocalyptic number.

It is an amenable number.

222646421 is a deficient number, since it is larger than the sum of its proper divisors (4413643).

222646421 is a wasteful number, since it uses less digits than its factorization.

222646421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20691.

The product of its digits is 9216, while the sum is 29.

The square root of 222646421 is about 14921.3411260516. The cubic root of 222646421 is about 606.0920294686.

The spelling of 222646421 in words is "two hundred twenty-two million, six hundred forty-six thousand, four hundred twenty-one".