11999210687 has 4 divisors (see below), whose sum is σ = 12071062416. Its totient is φ = 11927358960.

The previous prime is 11999210669. The next prime is 11999210689. The reversal of 11999210687 is 78601299911.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11999210687 - 2¹⁸ = 11998948543 is a prime.

It is a super-2 number, since 2×11999210687² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11999210689) 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, 35925614 + ... + 35925947.

It is an arithmetic number, because the mean of its divisors is an integer number (3017765604).

Almost surely, 2^11999210687 is an apocalyptic number.

11999210687 is a deficient number, since it is larger than the sum of its proper divisors (71851729).

11999210687 is an equidigital number, since it uses as much as digits as its factorization.

11999210687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71851728.

The product of its (nonzero) digits is 489888, while the sum is 53.

The spelling of 11999210687 in words is "eleven billion, nine hundred ninety-nine million, two hundred ten thousand, six hundred eighty-seven".