21268109769 has 8 divisors (see below), whose sum is σ = 28358158752. Its totient is φ = 14178400320.

The previous prime is 21268109747. The next prime is 21268109771. The reversal of 21268109769 is 96790186212.

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

It is not a de Polignac number, because 21268109769 - 2⁹ = 21268109257 is a prime.

It is a super-2 number, since 2×21268109769² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21268109969) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174577 + ... + 270209.

It is an arithmetic number, because the mean of its divisors is an integer number (3544769844).

Almost surely, 2^21268109769 is an apocalyptic number.

It is an amenable number.

21268109769 is a deficient number, since it is larger than the sum of its proper divisors (7090048983).

21268109769 is an equidigital number, since it uses as much as digits as its factorization.

21268109769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169767.

The product of its (nonzero) digits is 653184, while the sum is 51.

The spelling of 21268109769 in words is "twenty-one billion, two hundred sixty-eight million, one hundred nine thousand, seven hundred sixty-nine".