21238674 has 8 divisors (see below), whose sum is σ = 42477360. Its totient is φ = 7079556.

The previous prime is 21238669. The next prime is 21238681. The reversal of 21238674 is 47683212.

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

21238674 is an admirable number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1769884 + ... + 1769895.

It is an arithmetic number, because the mean of its divisors is an integer number (5309670).

Almost surely, 2^21238674 is an apocalyptic number.

21238674 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21238674 is a wasteful number, since it uses less digits than its factorization.

21238674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3539784.

The product of its digits is 16128, while the sum is 33.

The square root of 21238674 is about 4608.5435877292. The cubic root of 21238674 is about 276.9336945478.

It can be divided in two parts, 21238 and 674, that added together give a palindrome (21912).

The spelling of 21238674 in words is "twenty-one million, two hundred thirty-eight thousand, six hundred seventy-four".