21341738 has 24 divisors (see below), whose sum is σ = 36412740. Its totient is φ = 9363200.

The previous prime is 21341737. The next prime is 21341741. The reversal of 21341738 is 83714312.

It can be written as a sum of positive squares in 2 ways, for example, as 19070689 + 2271049 = 4367^2 + 1507^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a self number, because there is not a number n which added to its sum of digits gives 21341738.

It is not an unprimeable number, because it can be changed into a prime (21341737) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 5498 + ... + 8538.

Almost surely, 2^21341738 is an apocalyptic number.

21341738 is a deficient number, since it is larger than the sum of its proper divisors (15071002).

21341738 is a wasteful number, since it uses less digits than its factorization.

21341738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3094 (or 3083 counting only the distinct ones).

The product of its digits is 4032, while the sum is 29.

The square root of 21341738 is about 4619.7118957788. The cubic root of 21341738 is about 277.3809266482.

The spelling of 21341738 in words is "twenty-one million, three hundred forty-one thousand, seven hundred thirty-eight".