10721349889 has 4 divisors (see below), whose sum is σ = 10765837060. Its totient is φ = 10676862720.

The previous prime is 10721349871. The next prime is 10721349901. The reversal of 10721349889 is 98894312701.

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 4058709264 + 6662640625 = 63708^2 + 81625^2 .

It is a cyclic number.

It is not a de Polignac number, because 10721349889 - 2⁵ = 10721349857 is a prime.

It is a super-2 number, since 2×10721349889² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10721349839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22243224 + ... + 22243705.

It is an arithmetic number, because the mean of its divisors is an integer number (2691459265).

Almost surely, 2^10721349889 is an apocalyptic number.

It is an amenable number.

10721349889 is a deficient number, since it is larger than the sum of its proper divisors (44487171).

10721349889 is an equidigital number, since it uses as much as digits as its factorization.

10721349889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44487170.

The product of its (nonzero) digits is 870912, while the sum is 52.

The spelling of 10721349889 in words is "ten billion, seven hundred twenty-one million, three hundred forty-nine thousand, eight hundred eighty-nine".