21471499 has 8 divisors (see below), whose sum is σ = 25330688. Its totient is φ = 17810280.

The previous prime is 21471481. The next prime is 21471523. The reversal of 21471499 is 99417412.

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 21471499 - 2⁵ = 21471467 is a prime.

It is a super-2 number, since 2×21471499² = 922050538614002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21471409) 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, 49257 + ... + 49690.

It is an arithmetic number, because the mean of its divisors is an integer number (3166336).

Almost surely, 2^21471499 is an apocalyptic number.

21471499 is a deficient number, since it is larger than the sum of its proper divisors (3859189).

21471499 is an equidigital number, since it uses as much as digits as its factorization.

21471499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98985.

The product of its digits is 18144, while the sum is 37.

The square root of 21471499 is about 4633.7348866762. The cubic root of 21471499 is about 277.9419638007.

The spelling of 21471499 in words is "twenty-one million, four hundred seventy-one thousand, four hundred ninety-nine".