21741008 has 10 divisors (see below), whose sum is σ = 42123234. Its totient is φ = 10870496.

The previous prime is 21741001. The next prime is 21741019. The reversal of 21741008 is 80014712.

It can be written as a sum of positive squares in only one way, i.e., 21418384 + 322624 = 4628^2 + 568^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21741001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 679391 + ... + 679422.

Almost surely, 2^21741008 is an apocalyptic number.

It is an amenable number.

21741008 is a deficient number, since it is larger than the sum of its proper divisors (20382226).

21741008 is a wasteful number, since it uses less digits than its factorization.

21741008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1358821 (or 1358815 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 21741008 is about 4662.7253832925. The cubic root of 21741008 is about 279.1000356412.

The spelling of 21741008 in words is "twenty-one million, seven hundred forty-one thousand, eight".