21013753 has 8 divisors (see below), whose sum is σ = 22833920. Its totient is φ = 19265040.

The previous prime is 21013723. The next prime is 21013781. The reversal of 21013753 is 35731012.

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 21013753 - 2¹³ = 21005561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21013723) 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 7 ways as a sum of consecutive naturals, for example, 17250 + ... + 18427.

It is an arithmetic number, because the mean of its divisors is an integer number (2854240).

Almost surely, 2^21013753 is an apocalyptic number.

It is an amenable number.

21013753 is a deficient number, since it is larger than the sum of its proper divisors (1820167).

21013753 is a wasteful number, since it uses less digits than its factorization.

21013753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35727.

The product of its (nonzero) digits is 630, while the sum is 22.

The square root of 21013753 is about 4584.0760246750. The cubic root of 21013753 is about 275.9526322478.

Adding to 21013753 its reverse (35731012), we get a palindrome (56744765).

The spelling of 21013753 in words is "twenty-one million, thirteen thousand, seven hundred fifty-three".