21752230669 has 4 divisors (see below), whose sum is σ = 23425479196. Its totient is φ = 20078982144.

The previous prime is 21752230667. The next prime is 21752230723. The reversal of 21752230669 is 96603225712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13837993225 + 7914237444 = 117635^2 + 88962^2 .

It is not a de Polignac number, because 21752230669 - 2¹ = 21752230667 is a prime.

It is a super-2 number, since 2×21752230669² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21752230663) 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 3 ways as a sum of consecutive naturals, for example, 836624244 + ... + 836624269.

It is an arithmetic number, because the mean of its divisors is an integer number (5856369799).

Almost surely, 2^21752230669 is an apocalyptic number.

It is an amenable number.

21752230669 is a deficient number, since it is larger than the sum of its proper divisors (1673248527).

21752230669 is a wasteful number, since it uses less digits than its factorization.

21752230669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1673248526.

The product of its (nonzero) digits is 272160, while the sum is 43.

The spelling of 21752230669 in words is "twenty-one billion, seven hundred fifty-two million, two hundred thirty thousand, six hundred sixty-nine".