21064753 has 2 divisors, whose sum is σ = 21064754. Its totient is φ = 21064752.

The previous prime is 21064723. The next prime is 21064781. The reversal of 21064753 is 35746012.

It is an a-pointer prime, because the next prime (21064781) can be obtained adding 21064753 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18558864 + 2505889 = 4308^2 + 1583^2 .

It is a cyclic number.

It is not a de Polignac number, because 21064753 - 2¹³ = 21056561 is a prime.

It is not a weakly prime, because it can be changed into another prime (21064723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10532376 + 10532377.

It is an arithmetic number, because the mean of its divisors is an integer number (10532377).

Almost surely, 2^21064753 is an apocalyptic number.

It is an amenable number.

21064753 is a deficient number, since it is larger than the sum of its proper divisors (1).

21064753 is an equidigital number, since it uses as much as digits as its factorization.

21064753 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 21064753 is about 4589.6353885685. The cubic root of 21064753 is about 276.1756959104.

It can be divided in two parts, 2106 and 4753, that added together give a cube (6859 = 19³).

The spelling of 21064753 in words is "twenty-one million, sixty-four thousand, seven hundred fifty-three".