21469753 has 6 divisors (see below), whose sum is σ = 22659594. Its totient is φ = 20339424.

The previous prime is 21469739. The next prime is 21469757. The reversal of 21469753 is 35796412.

It can be written as a sum of positive squares in only one way, i.e., 19598329 + 1871424 = 4427^2 + 1368^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21469753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21469757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29376 + ... + 30097.

It is an arithmetic number, because the mean of its divisors is an integer number (3776599).

Almost surely, 2^21469753 is an apocalyptic number.

It is an amenable number.

21469753 is a deficient number, since it is larger than the sum of its proper divisors (1189841).

21469753 is an equidigital number, since it uses as much as digits as its factorization.

21469753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59511 (or 59492 counting only the distinct ones).

The product of its digits is 45360, while the sum is 37.

The square root of 21469753 is about 4633.5464819078. The cubic root of 21469753 is about 277.9344297851.

It can be divided in two parts, 21469 and 753, that added together give a palindrome (22222).

The spelling of 21469753 in words is "twenty-one million, four hundred sixty-nine thousand, seven hundred fifty-three".