21494193 has 24 divisors (see below), whose sum is σ = 33811488. Its totient is φ = 12108096.

The previous prime is 21494183. The next prime is 21494219. The reversal of 21494193 is 39149412.

It is not a de Polignac number, because 21494193 - 2¹³ = 21486001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21494173) 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, 9730 + ... + 11732.

It is an arithmetic number, because the mean of its divisors is an integer number (1408812).

Almost surely, 2^21494193 is an apocalyptic number.

It is an amenable number.

21494193 is a deficient number, since it is larger than the sum of its proper divisors (12317295).

21494193 is a wasteful number, since it uses less digits than its factorization.

21494193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2093 (or 2086 counting only the distinct ones).

The product of its digits is 7776, while the sum is 33.

The square root of 21494193 is about 4636.1830205461. The cubic root of 21494193 is about 278.0398516097.

The spelling of 21494193 in words is "twenty-one million, four hundred ninety-four thousand, one hundred ninety-three".