221068807 has 2 divisors, whose sum is σ = 221068808. Its totient is φ = 221068806.

The previous prime is 221068789. The next prime is 221068823. The reversal of 221068807 is 708860122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221068807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221068877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110534403 + 110534404.

It is an arithmetic number, because the mean of its divisors is an integer number (110534404).

Almost surely, 2^221068807 is an apocalyptic number.

221068807 is a deficient number, since it is larger than the sum of its proper divisors (1).

221068807 is an equidigital number, since it uses as much as digits as its factorization.

221068807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 221068807 is about 14868.3827970630. The cubic root of 221068807 is about 604.6570986774.

It can be divided in two parts, 2210 and 68807, that added together give a palindrome (71017).

The spelling of 221068807 in words is "two hundred twenty-one million, sixty-eight thousand, eight hundred seven".