21598479 has 12 divisors (see below), whose sum is σ = 35654736. Its totient is φ = 12341952.

The previous prime is 21598477. The next prime is 21598501. The reversal of 21598479 is 97489512.

It is not a de Polignac number, because 21598479 - 2¹ = 21598477 is a prime.

It is a super-2 number, since 2×21598479² = 932988590226882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21598477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 171354 + ... + 171479.

It is an arithmetic number, because the mean of its divisors is an integer number (2971228).

Almost surely, 2^21598479 is an apocalyptic number.

21598479 is a deficient number, since it is larger than the sum of its proper divisors (14056257).

21598479 is a wasteful number, since it uses less digits than its factorization.

21598479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342846 (or 342843 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 21598479 is about 4647.4163790218. The cubic root of 21598479 is about 278.4887929591.

The spelling of 21598479 in words is "twenty-one million, five hundred ninety-eight thousand, four hundred seventy-nine".