1022230721 has 2 divisors, whose sum is σ = 1022230722. Its totient is φ = 1022230720.

The previous prime is 1022230687. The next prime is 1022230733. The reversal of 1022230721 is 1270322201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 969450496 + 52780225 = 31136^2 + 7265^2 .

It is an emirp because it is prime and its reverse (1270322201) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1022230721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1022230693 and 1022230702.

It is not a weakly prime, because it can be changed into another prime (1022230421) 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, 511115360 + 511115361.

It is an arithmetic number, because the mean of its divisors is an integer number (511115361).

Almost surely, 2^1022230721 is an apocalyptic number.

It is an amenable number.

1022230721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1022230721 is an equidigital number, since it uses as much as digits as its factorization.

1022230721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 1022230721 is about 31972.3430639670. The cubic root of 1022230721 is about 1007.3559969627.

Adding to 1022230721 its reverse (1270322201), we get a palindrome (2292552922).

The spelling of 1022230721 in words is "one billion, twenty-two million, two hundred thirty thousand, seven hundred twenty-one".