21894361 has 8 divisors (see below), whose sum is σ = 22149504. Its totient is φ = 21641040.

The previous prime is 21894347. The next prime is 21894371. The reversal of 21894361 is 16349812.

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 21894361 - 2⁵ = 21894329 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21894331) 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, 46650 + ... + 47116.

It is an arithmetic number, because the mean of its divisors is an integer number (2768688).

Almost surely, 2^21894361 is an apocalyptic number.

It is an amenable number.

21894361 is a deficient number, since it is larger than the sum of its proper divisors (255143).

21894361 is a wasteful number, since it uses less digits than its factorization.

21894361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911.

The product of its digits is 10368, while the sum is 34.

The square root of 21894361 is about 4679.1410536550. The cubic root of 21894361 is about 279.7547214244.

The spelling of 21894361 in words is "twenty-one million, eight hundred ninety-four thousand, three hundred sixty-one".