21684294 has 32 divisors (see below), whose sum is σ = 49494240. Its totient is φ = 7032096.

The previous prime is 21684293. The next prime is 21684317. The reversal of 21684294 is 49248612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21684293) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3429 + ... + 7424.

It is an arithmetic number, because the mean of its divisors is an integer number (1546695).

Almost surely, 2^21684294 is an apocalyptic number.

21684294 is an abundant number, since it is smaller than the sum of its proper divisors (27809946).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21684294 is a wasteful number, since it uses less digits than its factorization.

21684294 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10901 (or 10895 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 21684294 is about 4656.6397756322. The cubic root of 21684294 is about 278.8571357836.

The spelling of 21684294 in words is "twenty-one million, six hundred eighty-four thousand, two hundred ninety-four".