21942376 has 16 divisors (see below), whose sum is σ = 43562340. Its totient is φ = 10325760.

The previous prime is 21942317. The next prime is 21942377. The reversal of 21942376 is 67324912.

It can be written as a sum of positive squares in 2 ways, for example, as 21846276 + 96100 = 4674^2 + 310^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (21942377) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 80535 + ... + 80806.

Almost surely, 2^21942376 is an apocalyptic number.

It is an amenable number.

21942376 is a deficient number, since it is larger than the sum of its proper divisors (21619964).

21942376 is a wasteful number, since it uses less digits than its factorization.

21942376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161364 (or 161360 counting only the distinct ones).

The product of its digits is 18144, while the sum is 34.

The square root of 21942376 is about 4684.2689931301. The cubic root of 21942376 is about 279.9590756515.

The spelling of 21942376 in words is "twenty-one million, nine hundred forty-two thousand, three hundred seventy-six".