10999221181 has 24 divisors (see below), whose sum is σ = 12342522920. Its totient is φ = 9801372672.

The previous prime is 10999221169. The next prime is 10999221193. The reversal of 10999221181 is 18112299901.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (10999221169) and next prime (10999221193).

It can be written as a sum of positive squares in 12 ways, for example, as 10833687225 + 165533956 = 104085^2 + 12866^2 .

It is not a de Polignac number, because 10999221181 - 2¹⁵ = 10999188413 is a prime.

It is a super-2 number, since 2×10999221181² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10999221151) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1844701 + ... + 1850653.

Almost surely, 2^10999221181 is an apocalyptic number.

It is an amenable number.

10999221181 is a deficient number, since it is larger than the sum of its proper divisors (1343301739).

10999221181 is an frugal number, since it uses more digits than its factorization.

10999221181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6050 (or 5995 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 43.

The spelling of 10999221181 in words is "ten billion, nine hundred ninety-nine million, two hundred twenty-one thousand, one hundred eighty-one".