21010753 has 8 divisors (see below), whose sum is σ = 22099968. Its totient is φ = 19936224.

The previous prime is 21010741. The next prime is 21010757. The reversal of 21010753 is 35701012.

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 21010753 - 2⁵ = 21010721 is a prime.

It is a super-3 number, since 3×21010753³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21010753.

It is not an unprimeable number, because it can be changed into a prime (21010757) 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, 676 + ... + 6517.

It is an arithmetic number, because the mean of its divisors is an integer number (2762496).

Almost surely, 2^21010753 is an apocalyptic number.

21010753 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21010753 is a deficient number, since it is larger than the sum of its proper divisors (1089215).

21010753 is a wasteful number, since it uses less digits than its factorization.

21010753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7343.

The product of its (nonzero) digits is 210, while the sum is 19.

The square root of 21010753 is about 4583.7487932914. The cubic root of 21010753 is about 275.9394996215.

Adding to 21010753 its reverse (35701012), we get a palindrome (56711765).

The spelling of 21010753 in words is "twenty-one million, ten thousand, seven hundred fifty-three".