21898359 has 24 divisors (see below), whose sum is σ = 36357152. Its totient is φ = 12441600.

The previous prime is 21898351. The next prime is 21898367. The reversal of 21898359 is 95389812.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21898351) and next prime (21898367).

It is not a de Polignac number, because 21898359 - 2³ = 21898351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21898351) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 11259 + ... + 13059.

Almost surely, 2^21898359 is an apocalyptic number.

21898359 is a deficient number, since it is larger than the sum of its proper divisors (14458793).

21898359 is a wasteful number, since it uses less digits than its factorization.

21898359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2007 (or 2004 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 21898359 is about 4679.5682493153. The cubic root of 21898359 is about 279.7717485074.

The spelling of 21898359 in words is "twenty-one million, eight hundred ninety-eight thousand, three hundred fifty-nine".