21741753 has 8 divisors (see below), whose sum is σ = 31624416. Its totient is φ = 13176800.

The previous prime is 21741749. The next prime is 21741781. The reversal of 21741753 is 35714712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21741753 - 2² = 21741749 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21741753.

It is not an unprimeable number, because it can be changed into a prime (21741743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 329388 + ... + 329453.

It is an arithmetic number, because the mean of its divisors is an integer number (3953052).

Almost surely, 2^21741753 is an apocalyptic number.

It is an amenable number.

21741753 is a deficient number, since it is larger than the sum of its proper divisors (9882663).

21741753 is a wasteful number, since it uses less digits than its factorization.

21741753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658855.

The product of its digits is 5880, while the sum is 30.

The square root of 21741753 is about 4662.8052715077. The cubic root of 21741753 is about 279.1032235822.

It can be divided in two parts, 217417 and 53, that added together give a triangular number (217470 = T₆₅₉).

The spelling of 21741753 in words is "twenty-one million, seven hundred forty-one thousand, seven hundred fifty-three".