222038521 has 2 divisors, whose sum is σ = 222038522. Its totient is φ = 222038520.

The previous prime is 222038497. The next prime is 222038543. The reversal of 222038521 is 125830222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 203376121 + 18662400 = 14261^2 + 4320^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222038521 is a prime.

It is a super-2 number, since 2×222038521² = 98602209615734882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (222030521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111019260 + 111019261.

It is an arithmetic number, because the mean of its divisors is an integer number (111019261).

Almost surely, 2^222038521 is an apocalyptic number.

It is an amenable number.

222038521 is a deficient number, since it is larger than the sum of its proper divisors (1).

222038521 is an equidigital number, since it uses as much as digits as its factorization.

222038521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 222038521 is about 14900.9570498005. The cubic root of 222038521 is about 605.5399146287.

Adding to 222038521 its reverse (125830222), we get a palindrome (347868743).

The spelling of 222038521 in words is "two hundred twenty-two million, thirty-eight thousand, five hundred twenty-one".