21966003 has 6 divisors (see below), whose sum is σ = 31728684. Its totient is φ = 14643996.

The previous prime is 21965987. The next prime is 21966019. The reversal of 21966003 is 30066912.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21965987) and next prime (21966019).

It is not a de Polignac number, because 21966003 - 2⁴ = 21965987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21966053) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1220325 + ... + 1220342.

It is an arithmetic number, because the mean of its divisors is an integer number (5288114).

Almost surely, 2^21966003 is an apocalyptic number.

21966003 is a deficient number, since it is larger than the sum of its proper divisors (9762681).

21966003 is a wasteful number, since it uses less digits than its factorization.

21966003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2440673 (or 2440670 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 21966003 is about 4686.7902662697. The cubic root of 21966003 is about 280.0595239098.

The spelling of 21966003 in words is "twenty-one million, nine hundred sixty-six thousand, three".