21074838 has 32 divisors (see below), whose sum is σ = 44620800. Its totient is φ = 6617376.

The previous prime is 21074813. The next prime is 21074843. The reversal of 21074838 is 83847012.

It is a junction number, because it is equal to n+sod(n) for n = 21074799 and 21074808.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25008 + ... + 25836.

It is an arithmetic number, because the mean of its divisors is an integer number (1394400).

Almost surely, 2^21074838 is an apocalyptic number.

21074838 is an abundant number, since it is smaller than the sum of its proper divisors (23545962).

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

21074838 is a wasteful number, since it uses less digits than its factorization.

21074838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076.

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 21074838 is about 4590.7339282516. The cubic root of 21074838 is about 276.2197630071.

It can be divided in two parts, 21074 and 838, that added together give a palindrome (21912).

The spelling of 21074838 in words is "twenty-one million, seventy-four thousand, eight hundred thirty-eight".