222121423 has 2 divisors, whose sum is σ = 222121424. Its totient is φ = 222121422.

The previous prime is 222121379. The next prime is 222121429. The reversal of 222121423 is 324121222.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 222121423 - 2²¹ = 220024271 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 222121423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222121429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111060711 + 111060712.

It is an arithmetic number, because the mean of its divisors is an integer number (111060712).

Almost surely, 2^222121423 is an apocalyptic number.

222121423 is a deficient number, since it is larger than the sum of its proper divisors (1).

222121423 is an equidigital number, since it uses as much as digits as its factorization.

222121423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 19.

The square root of 222121423 is about 14903.7385578250. The cubic root of 222121423 is about 605.6152682556.

Adding to 222121423 its reverse (324121222), we get a palindrome (546242645).

The spelling of 222121423 in words is "two hundred twenty-two million, one hundred twenty-one thousand, four hundred twenty-three".