21094938 has 16 divisors (see below), whose sum is σ = 46877760. Its totient is φ = 7031628.

The previous prime is 21094937. The next prime is 21094999. The reversal of 21094938 is 83949012.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21094937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195270 + ... + 195377.

It is an arithmetic number, because the mean of its divisors is an integer number (2929860).

Almost surely, 2^21094938 is an apocalyptic number.

21094938 is an abundant number, since it is smaller than the sum of its proper divisors (25782822).

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

21094938 is a wasteful number, since it uses less digits than its factorization.

21094938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390658 (or 390652 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 21094938 is about 4592.9225989559. The cubic root of 21094938 is about 276.3075494170.

The spelling of 21094938 in words is "twenty-one million, ninety-four thousand, nine hundred thirty-eight".