21478294 has 8 divisors (see below), whose sum is σ = 32271840. Its totient is φ = 10721016.

The previous prime is 21478291. The next prime is 21478307. The reversal of 21478294 is 49287412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21478294² = 922634226300872, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21478291) 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, 7534 + ... + 9985.

It is an arithmetic number, because the mean of its divisors is an integer number (4033980).

Almost surely, 2^21478294 is an apocalyptic number.

21478294 is a deficient number, since it is larger than the sum of its proper divisors (10793546).

21478294 is a wasteful number, since it uses less digits than its factorization.

21478294 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18134.

The product of its digits is 32256, while the sum is 37.

The square root of 21478294 is about 4634.4680385132. The cubic root of 21478294 is about 277.9712804381.

The spelling of 21478294 in words is "twenty-one million, four hundred seventy-eight thousand, two hundred ninety-four".