21314491 has 8 divisors (see below), whose sum is σ = 24263424. Its totient is φ = 18534120.

The previous prime is 21314473. The next prime is 21314497. The reversal of 21314491 is 19441312.

It is a happy number.

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

It is not a de Polignac number, because 21314491 - 2⁹ = 21313979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21314497) 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, 41871 + ... + 42376.

It is an arithmetic number, because the mean of its divisors is an integer number (3032928).

Almost surely, 2^21314491 is an apocalyptic number.

21314491 is a deficient number, since it is larger than the sum of its proper divisors (2948933).

21314491 is a wasteful number, since it uses less digits than its factorization.

21314491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84281.

The product of its digits is 864, while the sum is 25.

The square root of 21314491 is about 4616.7619605087. The cubic root of 21314491 is about 277.2628322872.

The spelling of 21314491 in words is "twenty-one million, three hundred fourteen thousand, four hundred ninety-one".