22721603 has 2 divisors, whose sum is σ = 22721604. Its totient is φ = 22721602.

The previous prime is 22721597. The next prime is 22721617. The reversal of 22721603 is 30612722.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22721603 - 2¹⁴ = 22705219 is a prime.

It is not a weakly prime, because it can be changed into another prime (22721653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11360801 + 11360802.

It is an arithmetic number, because the mean of its divisors is an integer number (11360802).

Almost surely, 2^22721603 is an apocalyptic number.

22721603 is a deficient number, since it is larger than the sum of its proper divisors (1).

22721603 is an equidigital number, since it uses as much as digits as its factorization.

22721603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 22721603 is about 4766.7182631240. The cubic root of 22721603 is about 283.2346108962.

The spelling of 22721603 in words is "twenty-two million, seven hundred twenty-one thousand, six hundred three".