222000521 has 2 divisors, whose sum is σ = 222000522. Its totient is φ = 222000520.

The previous prime is 222000487. The next prime is 222000523. The reversal of 222000521 is 125000222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185940496 + 36060025 = 13636^2 + 6005^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222000521 is a prime.

Together with 222000523, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 222000496 and 222000505.

It is not a weakly prime, because it can be changed into another prime (222000523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111000260 + 111000261.

It is an arithmetic number, because the mean of its divisors is an integer number (111000261).

Almost surely, 2^222000521 is an apocalyptic number.

It is an amenable number.

222000521 is a deficient number, since it is larger than the sum of its proper divisors (1).

222000521 is an equidigital number, since it uses as much as digits as its factorization.

222000521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 222000521 is about 14899.6819093563. The cubic root of 222000521 is about 605.5053683265.

Adding to 222000521 its reverse (125000222), we get a palindrome (347000743).

The spelling of 222000521 in words is "two hundred twenty-two million, five hundred twenty-one", and thus it is an aban number.