21498369 has 8 divisors (see below), whose sum is σ = 29439360. Its totient is φ = 13944816.

The previous prime is 21498343. The next prime is 21498377. The reversal of 21498369 is 96389412.

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

It is not a de Polignac number, because 21498369 - 2¹³ = 21490177 is a prime.

It is a super-2 number, since 2×21498369² = 924359739320322, which contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21498369.

It is not an unprimeable number, because it can be changed into a prime (21491369) 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, 96729 + ... + 96950.

It is an arithmetic number, because the mean of its divisors is an integer number (3679920).

Almost surely, 2^21498369 is an apocalyptic number.

It is an amenable number.

21498369 is a deficient number, since it is larger than the sum of its proper divisors (7940991).

21498369 is a wasteful number, since it uses less digits than its factorization.

21498369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193719.

The product of its digits is 93312, while the sum is 42.

The square root of 21498369 is about 4636.6333691591. The cubic root of 21498369 is about 278.0578567710.

The spelling of 21498369 in words is "twenty-one million, four hundred ninety-eight thousand, three hundred sixty-nine".