21140753 has 2 divisors, whose sum is σ = 21140754. Its totient is φ = 21140752.

The previous prime is 21140731. The next prime is 21140759. The reversal of 21140753 is 35704112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21086464 + 54289 = 4592^2 + 233^2 .

It is a cyclic number.

It is not a de Polignac number, because 21140753 - 2⁶ = 21140689 is a prime.

It is a super-3 number, since 3×21140753³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21140759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10570376 + 10570377.

It is an arithmetic number, because the mean of its divisors is an integer number (10570377).

Almost surely, 2^21140753 is an apocalyptic number.

It is an amenable number.

21140753 is a deficient number, since it is larger than the sum of its proper divisors (1).

21140753 is an equidigital number, since it uses as much as digits as its factorization.

21140753 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 21140753 is about 4597.9074588339. The cubic root of 21140753 is about 276.5074374489.

Adding to 21140753 its reverse (35704112), we get a palindrome (56844865).

The spelling of 21140753 in words is "twenty-one million, one hundred forty thousand, seven hundred fifty-three".