21122394 has 8 divisors (see below), whose sum is σ = 42244800. Its totient is φ = 7040796.

The previous prime is 21122393. The next prime is 21122399. The reversal of 21122394 is 49322112.

It is a sphenic number, since it is the product of 3 distinct primes.

21122394 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21122393) 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, 1760194 + ... + 1760205.

It is an arithmetic number, because the mean of its divisors is an integer number (5280600).

Almost surely, 2^21122394 is an apocalyptic number.

21122394 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21122394 is a wasteful number, since it uses less digits than its factorization.

21122394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3520404.

The product of its digits is 864, while the sum is 24.

The square root of 21122394 is about 4595.9105735425. The cubic root of 21122394 is about 276.4273729682.

The spelling of 21122394 in words is "twenty-one million, one hundred twenty-two thousand, three hundred ninety-four".