21374844 has 24 divisors (see below), whose sum is σ = 49954128. Its totient is φ = 7113600.

The previous prime is 21374819. The next prime is 21374849. The reversal of 21374844 is 44847312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21374849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10294 + ... + 12194.

It is an arithmetic number, because the mean of its divisors is an integer number (2081422).

Almost surely, 2^21374844 is an apocalyptic number.

It is an amenable number.

21374844 is an abundant number, since it is smaller than the sum of its proper divisors (28579284).

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

21374844 is a wasteful number, since it uses less digits than its factorization.

21374844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2845 (or 2843 counting only the distinct ones).

The product of its digits is 21504, while the sum is 33.

The square root of 21374844 is about 4623.2936311682. The cubic root of 21374844 is about 277.5242799955.

It can be divided in two parts, 213 and 74844, that added together give a palindrome (75057).

The spelling of 21374844 in words is "twenty-one million, three hundred seventy-four thousand, eight hundred forty-four".