12109999505 has 24 divisors (see below), whose sum is σ = 15349118400. Its totient is φ = 9170913312.

The previous prime is 12109999463. The next prime is 12109999541. The reversal of 12109999505 is 50599990121.

It is not a de Polignac number, because 12109999505 - 2¹² = 12109995409 is a prime.

It is a super-2 number, since 2×12109999505² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3931556 + ... + 3934634.

It is an arithmetic number, because the mean of its divisors is an integer number (639546600).

Almost surely, 2^12109999505 is an apocalyptic number.

It is an amenable number.

12109999505 is a deficient number, since it is larger than the sum of its proper divisors (3239118895).

12109999505 is a wasteful number, since it uses less digits than its factorization.

12109999505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5301 (or 5282 counting only the distinct ones).

The product of its (nonzero) digits is 328050, while the sum is 50.

The spelling of 12109999505 in words is "twelve billion, one hundred nine million, nine hundred ninety-nine thousand, five hundred five".