21946329 has 16 divisors (see below), whose sum is σ = 32610240. Its totient is φ = 14587200.

The previous prime is 21946271. The next prime is 21946333. The reversal of 21946329 is 92364912.

21946329 is a `hidden beast` number, since 2 + 19 + 4 + 632 + 9 = 666.

It is not a de Polignac number, because 21946329 - 2¹⁷ = 21815257 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21946293 and 21946302.

It is not an unprimeable number, because it can be changed into a prime (21946369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9814 + ... + 11840.

It is an arithmetic number, because the mean of its divisors is an integer number (2038140).

Almost surely, 2^21946329 is an apocalyptic number.

It is an amenable number.

21946329 is a deficient number, since it is larger than the sum of its proper divisors (10663911).

21946329 is a wasteful number, since it uses less digits than its factorization.

21946329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2437 (or 2431 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 21946329 is about 4684.6909182997. The cubic root of 21946329 is about 279.9758865289.

The spelling of 21946329 in words is "twenty-one million, nine hundred forty-six thousand, three hundred twenty-nine".