21180753 has 12 divisors (see below), whose sum is σ = 33375888. Its totient is φ = 12836760.

The previous prime is 21180751. The next prime is 21180773. The reversal of 21180753 is 35708112.

It is not a de Polignac number, because 21180753 - 2¹ = 21180751 is a prime.

It is a super-3 number, since 3×21180753³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21180751) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 106875 + ... + 107072.

It is an arithmetic number, because the mean of its divisors is an integer number (2781324).

Almost surely, 2^21180753 is an apocalyptic number.

It is an amenable number.

21180753 is a deficient number, since it is larger than the sum of its proper divisors (12195135).

21180753 is a wasteful number, since it uses less digits than its factorization.

21180753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213964 (or 213961 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 21180753 is about 4602.2552080475. The cubic root of 21180753 is about 276.6817189920.

Adding to 21180753 its reverse (35708112), we get a palindrome (56888865).

The spelling of 21180753 in words is "twenty-one million, one hundred eighty thousand, seven hundred fifty-three".