21473898 has 16 divisors (see below), whose sum is σ = 43013376. Its totient is φ = 7147040.

The previous prime is 21473867. The next prime is 21473909. The reversal of 21473898 is 89837412.

It is a super-2 number, since 2×21473898² = 922256590628808, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2215 + ... + 6917.

It is an arithmetic number, because the mean of its divisors is an integer number (2688336).

Almost surely, 2^21473898 is an apocalyptic number.

21473898 is an abundant number, since it is smaller than the sum of its proper divisors (21539478).

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

21473898 is a wasteful number, since it uses less digits than its factorization.

21473898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5469.

The product of its digits is 96768, while the sum is 42.

The square root of 21473898 is about 4633.9937419034. The cubic root of 21473898 is about 277.9523148547.

The spelling of 21473898 in words is "twenty-one million, four hundred seventy-three thousand, eight hundred ninety-eight".