21494395 has 8 divisors (see below), whose sum is σ = 27777456. Its totient is φ = 15872736.

The previous prime is 21494353. The next prime is 21494411. The reversal of 21494395 is 59349412.

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 21494395 - 2¹⁷ = 21363323 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165277 + ... + 165406.

It is an arithmetic number, because the mean of its divisors is an integer number (3472182).

Almost surely, 2^21494395 is an apocalyptic number.

21494395 is a deficient number, since it is larger than the sum of its proper divisors (6283061).

21494395 is a wasteful number, since it uses less digits than its factorization.

21494395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330701.

The product of its digits is 38880, while the sum is 37.

The square root of 21494395 is about 4636.2048056573. The cubic root of 21494395 is about 278.0407226027.

The spelling of 21494395 in words is "twenty-one million, four hundred ninety-four thousand, three hundred ninety-five".