21560894 has 4 divisors (see below), whose sum is σ = 32341344. Its totient is φ = 10780446.

The previous prime is 21560893. The next prime is 21560909. The reversal of 21560894 is 49806512.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21560893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5390222 + ... + 5390225.

It is an arithmetic number, because the mean of its divisors is an integer number (8085336).

Almost surely, 2^21560894 is an apocalyptic number.

21560894 is a deficient number, since it is larger than the sum of its proper divisors (10780450).

21560894 is a wasteful number, since it uses less digits than its factorization.

21560894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10780449.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 21560894 is about 4643.3709737646. The cubic root of 21560894 is about 278.3271599939.

It can be divided in two parts, 2 and 1560894, that added together give a cube (1560896 = 116³).

The spelling of 21560894 in words is "twenty-one million, five hundred sixty thousand, eight hundred ninety-four".