21598454 has 16 divisors (see below), whose sum is σ = 33907248. Its totient is φ = 10307232.

The previous prime is 21598441. The next prime is 21598457. The reversal of 21598454 is 45489512.

21598454 is nontrivially palindromic in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21598457) 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, 1169 + ... + 6675.

It is an arithmetic number, because the mean of its divisors is an integer number (2119203).

Almost surely, 2^21598454 is an apocalyptic number.

21598454 is a deficient number, since it is larger than the sum of its proper divisors (12308794).

21598454 is a wasteful number, since it uses less digits than its factorization.

21598454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5599.

The product of its digits is 57600, while the sum is 38.

The square root of 21598454 is about 4647.4136893545. The cubic root of 21598454 is about 278.4886855098.

The spelling of 21598454 in words is "twenty-one million, five hundred ninety-eight thousand, four hundred fifty-four".