221090803 has 2 divisors, whose sum is σ = 221090804. Its totient is φ = 221090802.

The previous prime is 221090777. The next prime is 221090827. The reversal of 221090803 is 308090122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221090803 is a prime.

It is a super-2 number, since 2×221090803² = 97762286342369618, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221090843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110545401 + 110545402.

It is an arithmetic number, because the mean of its divisors is an integer number (110545402).

Almost surely, 2^221090803 is an apocalyptic number.

221090803 is a deficient number, since it is larger than the sum of its proper divisors (1).

221090803 is an equidigital number, since it uses as much as digits as its factorization.

221090803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 221090803 is about 14869.1224690632. The cubic root of 221090803 is about 604.6771521571.

The spelling of 221090803 in words is "two hundred twenty-one million, ninety thousand, eight hundred three".