21498743 has 8 divisors (see below), whose sum is σ = 24866688. Its totient is φ = 18204984.

The previous prime is 21498733. The next prime is 21498793. The reversal of 21498743 is 34789412.

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

It is not a de Polignac number, because 21498743 - 2⁶ = 21498679 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 21498697 and 21498706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21498703) 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, 17921 + ... + 19082.

It is an arithmetic number, because the mean of its divisors is an integer number (3108336).

Almost surely, 2^21498743 is an apocalyptic number.

21498743 is a deficient number, since it is larger than the sum of its proper divisors (3367945).

21498743 is an equidigital number, since it uses as much as digits as its factorization.

21498743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37093.

The product of its digits is 48384, while the sum is 38.

The square root of 21498743 is about 4636.6736999707. The cubic root of 21498743 is about 278.0594691884.

The spelling of 21498743 in words is "twenty-one million, four hundred ninety-eight thousand, seven hundred forty-three".