21113403 has 8 divisors (see below), whose sum is σ = 28174608. Its totient is φ = 14063904.

The previous prime is 21113399. The next prime is 21113423. The reversal of 21113403 is 30431112.

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

It is not a de Polignac number, because 21113403 - 2² = 21113399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21113423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3001 + ... + 7157.

It is an arithmetic number, because the mean of its divisors is an integer number (3521826).

Almost surely, 2^21113403 is an apocalyptic number.

21113403 is a deficient number, since it is larger than the sum of its proper divisors (7061205).

21113403 is a wasteful number, since it uses less digits than its factorization.

21113403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5853.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 21113403 is about 4594.9323172382. The cubic root of 21113403 is about 276.3881458611.

Adding to 21113403 its reverse (30431112), we get a palindrome (51544515).

The spelling of 21113403 in words is "twenty-one million, one hundred thirteen thousand, four hundred three".