21913826 has 24 divisors (see below), whose sum is σ = 36599472. Its totient is φ = 9831800.

The previous prime is 21913819. The next prime is 21913831. The reversal of 21913826 is 62831912.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21913792 and 21913801.

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 11 ways as a sum of consecutive naturals, for example, 19541 + ... + 20631.

It is an arithmetic number, because the mean of its divisors is an integer number (1524978).

Almost surely, 2^21913826 is an apocalyptic number.

21913826 is a deficient number, since it is larger than the sum of its proper divisors (14685646).

21913826 is a wasteful number, since it uses less digits than its factorization.

21913826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1198 (or 1187 counting only the distinct ones).

The product of its digits is 5184, while the sum is 32.

The square root of 21913826 is about 4681.2205673307. The cubic root of 21913826 is about 279.8376014061.

The spelling of 21913826 in words is "twenty-one million, nine hundred thirteen thousand, eight hundred twenty-six".