21994895 has 8 divisors (see below), whose sum is σ = 28424256. Its totient is φ = 16242336.

The previous prime is 21994867. The next prime is 21994897. The reversal of 21994895 is 59849912.

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 21994895 - 2¹⁰ = 21993871 is a prime.

It is a super-2 number, since 2×21994895² = 967550812122050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21994897) 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, 169127 + ... + 169256.

It is an arithmetic number, because the mean of its divisors is an integer number (3553032).

Almost surely, 2^21994895 is an apocalyptic number.

21994895 is a deficient number, since it is larger than the sum of its proper divisors (6429361).

21994895 is a wasteful number, since it uses less digits than its factorization.

21994895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338401.

The product of its digits is 233280, while the sum is 47.

The square root of 21994895 is about 4689.8715334218. The cubic root of 21994895 is about 280.1822580393.

The spelling of 21994895 in words is "twenty-one million, nine hundred ninety-four thousand, eight hundred ninety-five".