222400421 has 4 divisors (see below), whose sum is σ = 222887532. Its totient is φ = 221913312.

The previous prime is 222400397. The next prime is 222400469. The reversal of 222400421 is 124004222.

It is a happy number.

222400421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 189750625 + 32649796 = 13775^2 + 5714^2 .

It is a cyclic number.

It is not a de Polignac number, because 222400421 - 2⁶ = 222400357 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 222400421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222400021) 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, 242870 + ... + 243783.

It is an arithmetic number, because the mean of its divisors is an integer number (55721883).

Almost surely, 2^222400421 is an apocalyptic number.

It is an amenable number.

222400421 is a deficient number, since it is larger than the sum of its proper divisors (487111).

222400421 is an equidigital number, since it uses as much as digits as its factorization.

222400421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487110.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 222400421 is about 14913.0956209635. The cubic root of 222400421 is about 605.8687253543.

Adding to 222400421 its reverse (124004222), we get a palindrome (346404643).

The spelling of 222400421 in words is "two hundred twenty-two million, four hundred thousand, four hundred twenty-one".