21302894 has 8 divisors (see below), whose sum is σ = 32496120. Its totient is φ = 10470856.

The previous prime is 21302893. The next prime is 21302909. The reversal of 21302894 is 49820312.

It is a sphenic number, since it is the product of 3 distinct 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 (21302893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90149 + ... + 90384.

It is an arithmetic number, because the mean of its divisors is an integer number (4062015).

Almost surely, 2^21302894 is an apocalyptic number.

21302894 is a deficient number, since it is larger than the sum of its proper divisors (11193226).

21302894 is a wasteful number, since it uses less digits than its factorization.

21302894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180594.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 21302894 is about 4615.5058227674. The cubic root of 21302894 is about 277.2125378591.

The spelling of 21302894 in words is "twenty-one million, three hundred two thousand, eight hundred ninety-four".