21279498 has 8 divisors (see below), whose sum is σ = 42559008. Its totient is φ = 7093164.

The previous prime is 21279497. The next prime is 21279521. The reversal of 21279498 is 89497212.

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

21279498 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21279493) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1773286 + ... + 1773297.

It is an arithmetic number, because the mean of its divisors is an integer number (5319876).

Almost surely, 2^21279498 is an apocalyptic number.

21279498 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21279498 is a wasteful number, since it uses less digits than its factorization.

21279498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3546588.

The product of its digits is 72576, while the sum is 42.

The square root of 21279498 is about 4612.9706263968. The cubic root of 21279498 is about 277.1110173758. Note that the first 3 decimals are identical.

The spelling of 21279498 in words is "twenty-one million, two hundred seventy-nine thousand, four hundred ninety-eight".