21112403 has 8 divisors (see below), whose sum is σ = 23048928. Its totient is φ = 19220544.

The previous prime is 21112381. The next prime is 21112411. The reversal of 21112403 is 30421112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21112403 - 2⁶ = 21112339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112433) 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, 10175 + ... + 12072.

It is an arithmetic number, because the mean of its divisors is an integer number (2881116).

Almost surely, 2^21112403 is an apocalyptic number.

21112403 is a deficient number, since it is larger than the sum of its proper divisors (1936525).

21112403 is a wasteful number, since it uses less digits than its factorization.

21112403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22333.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21112403 is about 4594.8235004187. The cubic root of 21112403 is about 276.3837822426.

Adding to 21112403 its reverse (30421112), we get a palindrome (51533515).

The spelling of 21112403 in words is "twenty-one million, one hundred twelve thousand, four hundred three".