21942324 has 18 divisors (see below), whose sum is σ = 55465410. Its totient is φ = 7314096.

The previous prime is 21942317. The next prime is 21942377. The reversal of 21942324 is 42324912.

21942324 is a `hidden beast` number, since 219 + 423 + 24 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21790224 + 152100 = 4668^2 + 390^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 304719 + ... + 304790.

Almost surely, 2^21942324 is an apocalyptic number.

It is an amenable number.

21942324 is an abundant number, since it is smaller than the sum of its proper divisors (33523086).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21942324 is a wasteful number, since it uses less digits than its factorization.

21942324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609519 (or 609514 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 21942324 is about 4684.2634426343. The cubic root of 21942324 is about 279.9588544983.

The spelling of 21942324 in words is "twenty-one million, nine hundred forty-two thousand, three hundred twenty-four".