21160403 has 8 divisors (see below), whose sum is σ = 23224320. Its totient is φ = 19119880.

The previous prime is 21160397. The next prime is 21160439. The reversal of 21160403 is 30406112.

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 21160403 - 2⁶ = 21160339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21160003) 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, 3923 + ... + 7596.

It is an arithmetic number, because the mean of its divisors is an integer number (2903040).

Almost surely, 2^21160403 is an apocalyptic number.

21160403 is a deficient number, since it is larger than the sum of its proper divisors (2063917).

21160403 is a wasteful number, since it uses less digits than its factorization.

21160403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11697.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 21160403 is about 4600.0438041393. The cubic root of 21160403 is about 276.5930807024.

Adding to 21160403 its reverse (30406112), we get a palindrome (51566515).

The spelling of 21160403 in words is "twenty-one million, one hundred sixty thousand, four hundred three".