21741347 has 4 divisors (see below), whose sum is σ = 21850800. Its totient is φ = 21631896.

The previous prime is 21741341. The next prime is 21741367. The reversal of 21741347 is 74314712.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21741347 - 2¹⁶ = 21675811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21741341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54428 + ... + 54825.

It is an arithmetic number, because the mean of its divisors is an integer number (5462700).

Almost surely, 2^21741347 is an apocalyptic number.

21741347 is a deficient number, since it is larger than the sum of its proper divisors (109453).

21741347 is a wasteful number, since it uses less digits than its factorization.

21741347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109452.

The product of its digits is 4704, while the sum is 29.

The square root of 21741347 is about 4662.7617352809. The cubic root of 21741347 is about 279.1014862703.

The spelling of 21741347 in words is "twenty-one million, seven hundred forty-one thousand, three hundred forty-seven".