21494358 has 48 divisors (see below), whose sum is σ = 51919920. Its totient is φ = 6386688.

The previous prime is 21494353. The next prime is 21494411. The reversal of 21494358 is 85349412.

21494358 is a `hidden beast` number, since 214 + 9 + 435 + 8 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21494353) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3966 + ... + 7662.

It is an arithmetic number, because the mean of its divisors is an integer number (1081665).

Almost surely, 2^21494358 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21494358, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25959960).

21494358 is an abundant number, since it is smaller than the sum of its proper divisors (30425562).

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

21494358 is a wasteful number, since it uses less digits than its factorization.

21494358 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3741 (or 3738 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 21494358 is about 4636.2008153228. The cubic root of 21494358 is about 278.0405630648.

The spelling of 21494358 in words is "twenty-one million, four hundred ninety-four thousand, three hundred fifty-eight".