221023013 has 2 divisors, whose sum is σ = 221023014. Its totient is φ = 221023012.

The previous prime is 221023003. The next prime is 221023037. The reversal of 221023013 is 310320122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220908769 + 114244 = 14863^2 + 338^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221023013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221023003) 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, 110511506 + 110511507.

It is an arithmetic number, because the mean of its divisors is an integer number (110511507).

Almost surely, 2^221023013 is an apocalyptic number.

It is an amenable number.

221023013 is a deficient number, since it is larger than the sum of its proper divisors (1).

221023013 is an equidigital number, since it uses as much as digits as its factorization.

221023013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 221023013 is about 14866.8427381203. The cubic root of 221023013 is about 604.6153445893.

Adding to 221023013 its reverse (310320122), we get a palindrome (531343135).

The spelling of 221023013 in words is "two hundred twenty-one million, twenty-three thousand, thirteen".