21541674 has 48 divisors (see below), whose sum is σ = 54681696. Its totient is φ = 5594400.

The previous prime is 21541661. The next prime is 21541697. The reversal of 21541674 is 47614512.

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 23 ways as a sum of consecutive naturals, for example, 97 + ... + 6564.

It is an arithmetic number, because the mean of its divisors is an integer number (1139202).

Almost surely, 2^21541674 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21541674, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27340848).

21541674 is an abundant number, since it is smaller than the sum of its proper divisors (33140022).

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

21541674 is a wasteful number, since it uses less digits than its factorization.

21541674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6691 (or 6684 counting only the distinct ones).

The product of its digits is 6720, while the sum is 30.

The square root of 21541674 is about 4641.3008952232. The cubic root of 21541674 is about 278.2444324664.

It can be divided in two parts, 2154 and 1674, that added together give a triangular number (3828 = T₈₇).

The spelling of 21541674 in words is "twenty-one million, five hundred forty-one thousand, six hundred seventy-four".