21885003 has 24 divisors (see below), whose sum is σ = 36261888. Its totient is φ = 12459312.

The previous prime is 21884987. The next prime is 21885013. The reversal of 21885003 is 30058812.

It is a happy number.

It is not a de Polignac number, because 21885003 - 2⁴ = 21884987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21885013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23676 + ... + 24582.

It is an arithmetic number, because the mean of its divisors is an integer number (1510912).

Almost surely, 2^21885003 is an apocalyptic number.

21885003 is a deficient number, since it is larger than the sum of its proper divisors (14376885).

21885003 is a wasteful number, since it uses less digits than its factorization.

21885003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1303 (or 1300 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 21885003 is about 4678.1409769266. The cubic root of 21885003 is about 279.7148585307.

The spelling of 21885003 in words is "twenty-one million, eight hundred eighty-five thousand, three".