222501421 has 2 divisors, whose sum is σ = 222501422. Its totient is φ = 222501420.

The previous prime is 222501403. The next prime is 222501437. The reversal of 222501421 is 124105222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134235396 + 88266025 = 11586^2 + 9395^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222501421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222501481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111250710 + 111250711.

It is an arithmetic number, because the mean of its divisors is an integer number (111250711).

Almost surely, 2^222501421 is an apocalyptic number.

It is an amenable number.

222501421 is a deficient number, since it is larger than the sum of its proper divisors (1).

222501421 is an equidigital number, since it uses as much as digits as its factorization.

222501421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 222501421 is about 14916.4815221285. The cubic root of 222501421 is about 605.9604270397.

Adding to 222501421 its reverse (124105222), we get a palindrome (346606643).

The spelling of 222501421 in words is "two hundred twenty-two million, five hundred one thousand, four hundred twenty-one".