21960329 has 4 divisors (see below), whose sum is σ = 22177860. Its totient is φ = 21742800.

The previous prime is 21960319. The next prime is 21960343. The reversal of 21960329 is 92306912.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19784704 + 2175625 = 4448^2 + 1475^2 .

It is a cyclic number.

It is not a de Polignac number, because 21960329 - 2⁴ = 21960313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21960295 and 21960304.

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, 108614 + ... + 108815.

It is an arithmetic number, because the mean of its divisors is an integer number (5544465).

Almost surely, 2^21960329 is an apocalyptic number.

It is an amenable number.

21960329 is a deficient number, since it is larger than the sum of its proper divisors (217531).

21960329 is a wasteful number, since it uses less digits than its factorization.

21960329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217530.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 21960329 is about 4686.1849088571. The cubic root of 21960329 is about 280.0354079372.

The spelling of 21960329 in words is "twenty-one million, nine hundred sixty thousand, three hundred twenty-nine".