21024359 has 4 divisors (see below), whose sum is σ = 22261104. Its totient is φ = 19787616.

The previous prime is 21024331. The next prime is 21024361. The reversal of 21024359 is 95342012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21024359 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 (21024379) 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, 618347 + ... + 618380.

It is an arithmetic number, because the mean of its divisors is an integer number (5565276).

Almost surely, 2^21024359 is an apocalyptic number.

21024359 is a deficient number, since it is larger than the sum of its proper divisors (1236745).

21024359 is a wasteful number, since it uses less digits than its factorization.

21024359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1236744.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 21024359 is about 4585.2327094707. The cubic root of 21024359 is about 275.9990504413. Note that the first 3 decimals are identical.

The spelling of 21024359 in words is "twenty-one million, twenty-four thousand, three hundred fifty-nine".