222424921 has 2 divisors, whose sum is σ = 222424922. Its totient is φ = 222424920.

The previous prime is 222424919. The next prime is 222424933. The reversal of 222424921 is 129424222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134815321 + 87609600 = 11611^2 + 9360^2 .

It is a cyclic number.

It is not a de Polignac number, because 222424921 - 2¹ = 222424919 is a prime.

Together with 222424919, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 222424921.

It is not a weakly prime, because it can be changed into another prime (222424981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111212460 + 111212461.

It is an arithmetic number, because the mean of its divisors is an integer number (111212461).

Almost surely, 2^222424921 is an apocalyptic number.

It is an amenable number.

222424921 is a deficient number, since it is larger than the sum of its proper divisors (1).

222424921 is an equidigital number, since it uses as much as digits as its factorization.

222424921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 28.

The square root of 222424921 is about 14913.9170240417. The cubic root of 222424921 is about 605.8909723726.

The spelling of 222424921 in words is "two hundred twenty-two million, four hundred twenty-four thousand, nine hundred twenty-one".