221772303 has 8 divisors (see below), whose sum is σ = 328551600. Its totient is φ = 147848184.

The previous prime is 221772301. The next prime is 221772307. The reversal of 221772303 is 303277122.

It is a happy number.

It is not a de Polignac number, because 221772303 - 2¹ = 221772301 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 8213789 = 221772303 / (2 + 2 + 1 + 7 + 7 + 2 + 3 + 0 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221772301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4106868 + ... + 4106921.

It is an arithmetic number, because the mean of its divisors is an integer number (41068950).

Almost surely, 2^221772303 is an apocalyptic number.

221772303 is a deficient number, since it is larger than the sum of its proper divisors (106779297).

221772303 is an equidigital number, since it uses as much as digits as its factorization.

221772303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8213798 (or 8213792 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 27.

The square root of 221772303 is about 14892.0214544567. The cubic root of 221772303 is about 605.2978093486.

Adding to 221772303 its sum of digits (27), we get a triangular number (221772330 = T₂₁₀₆₀).

The spelling of 221772303 in words is "two hundred twenty-one million, seven hundred seventy-two thousand, three hundred three".