11936921887 has 6 divisors (see below), whose sum is σ = 13120748984. Its totient is φ = 10851747060.

The previous prime is 11936921881. The next prime is 11936921891. The reversal of 11936921887 is 78812963911.

It is a happy number.

It is not a de Polignac number, because 11936921887 - 2²⁷ = 11802704159 is a prime.

It is a super-3 number, since 3×11936921887³ (a number of 31 digits) contains 333 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 (11936921881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 49326003 + ... + 49326244.

Almost surely, 2^11936921887 is an apocalyptic number.

11936921887 is a deficient number, since it is larger than the sum of its proper divisors (1183827097).

11936921887 is an equidigital number, since it uses as much as digits as its factorization.

11936921887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98652269 (or 98652258 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 55.

The spelling of 11936921887 in words is "eleven billion, nine hundred thirty-six million, nine hundred twenty-one thousand, eight hundred eighty-seven".