221690003 has 2 divisors, whose sum is σ = 221690004. Its totient is φ = 221690002.

The previous prime is 221689973. The next prime is 221690009. The reversal of 221690003 is 300096122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221690003 - 2²² = 217495699 is a prime.

It is not a weakly prime, because it can be changed into another prime (221690009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110845001 + 110845002.

It is an arithmetic number, because the mean of its divisors is an integer number (110845002).

Almost surely, 2^221690003 is an apocalyptic number.

221690003 is a deficient number, since it is larger than the sum of its proper divisors (1).

221690003 is an equidigital number, since it uses as much as digits as its factorization.

221690003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 221690003 is about 14889.2579734519. The cubic root of 221690003 is about 605.2229244741. Note that the first 3 decimals are identical.

The spelling of 221690003 in words is "two hundred twenty-one million, six hundred ninety thousand, three".