21294838 has 16 divisors (see below), whose sum is σ = 32497920. Its totient is φ = 10463976.

The previous prime is 21294827. The next prime is 21294841. The reversal of 21294838 is 83849212.

It is a junction number, because it is equal to n+sod(n) for n = 21294797 and 21294806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34093 + ... + 34711.

It is an arithmetic number, because the mean of its divisors is an integer number (2031120).

Almost surely, 2^21294838 is an apocalyptic number.

21294838 is a deficient number, since it is larger than the sum of its proper divisors (11203082).

21294838 is a wasteful number, since it uses less digits than its factorization.

21294838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891.

The product of its digits is 27648, while the sum is 37.

The square root of 21294838 is about 4614.6330298302. The cubic root of 21294838 is about 277.1775894655.

The spelling of 21294838 in words is "twenty-one million, two hundred ninety-four thousand, eight hundred thirty-eight".