21169329245 has 8 divisors (see below), whose sum is σ = 25550035416. Its totient is φ = 16837569856.

The previous prime is 21169329193. The next prime is 21169329253. The reversal of 21169329245 is 54292396112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8295930724 + 12873398521 = 91082^2 + 113461^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21169329245 - 2⁸ = 21169328989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21169329196 and 21169329205.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12235742 + ... + 12237471.

It is an arithmetic number, because the mean of its divisors is an integer number (3193754427).

Almost surely, 2^21169329245 is an apocalyptic number.

It is an amenable number.

21169329245 is a deficient number, since it is larger than the sum of its proper divisors (4380706171).

21169329245 is a wasteful number, since it uses less digits than its factorization.

21169329245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24473391.

The product of its digits is 233280, while the sum is 44.

The spelling of 21169329245 in words is "twenty-one billion, one hundred sixty-nine million, three hundred twenty-nine thousand, two hundred forty-five".