21494684 has 12 divisors (see below), whose sum is σ = 38913000. Its totient is φ = 10376688.

The previous prime is 21494677. The next prime is 21494689. The reversal of 21494684 is 48649412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21494689) 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, 92534 + ... + 92765.

It is an arithmetic number, because the mean of its divisors is an integer number (3242750).

Almost surely, 2^21494684 is an apocalyptic number.

It is an amenable number.

21494684 is a deficient number, since it is larger than the sum of its proper divisors (17418316).

21494684 is a wasteful number, since it uses less digits than its factorization.

21494684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185332 (or 185330 counting only the distinct ones).

The product of its digits is 55296, while the sum is 38.

The square root of 21494684 is about 4636.2359732870. The cubic root of 21494684 is about 278.0419687169.

The spelling of 21494684 in words is "twenty-one million, four hundred ninety-four thousand, six hundred eighty-four".