21960359 has 4 divisors (see below), whose sum is σ = 22165704. Its totient is φ = 21755016.

The previous prime is 21960349. The next prime is 21960361. The reversal of 21960359 is 95306912.

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

It is a cyclic number.

It is not a de Polignac number, because 21960359 - 2⁴ = 21960343 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 (21960319) 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, 102512 + ... + 102725.

It is an arithmetic number, because the mean of its divisors is an integer number (5541426).

Almost surely, 2^21960359 is an apocalyptic number.

21960359 is a deficient number, since it is larger than the sum of its proper divisors (205345).

21960359 is a wasteful number, since it uses less digits than its factorization.

21960359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205344.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 21960359 is about 4686.1881097540. The cubic root of 21960359 is about 280.0355354559.

The spelling of 21960359 in words is "twenty-one million, nine hundred sixty thousand, three hundred fifty-nine".