21494443 has 8 divisors (see below), whose sum is σ = 23748768. Its totient is φ = 19350144.

The previous prime is 21494441. The next prime is 21494449. The reversal of 21494443 is 34449412.

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

It is a cyclic number.

It is not a de Polignac number, because 21494443 - 2¹ = 21494441 is a prime.

It is a super-2 number, since 2×21494443² = 924022159760498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21494441) 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, 27096 + ... + 27877.

It is an arithmetic number, because the mean of its divisors is an integer number (2968596).

Almost surely, 2^21494443 is an apocalyptic number.

21494443 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21494443 is a deficient number, since it is larger than the sum of its proper divisors (2254325).

21494443 is a wasteful number, since it uses less digits than its factorization.

21494443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55013.

The product of its digits is 13824, while the sum is 31.

The square root of 21494443 is about 4636.2099823024. The cubic root of 21494443 is about 278.0409295705.

The spelling of 21494443 in words is "twenty-one million, four hundred ninety-four thousand, four hundred forty-three".