11887660021 has 4 divisors (see below), whose sum is σ = 11914494912. Its totient is φ = 11860825132.

The previous prime is 11887660013. The next prime is 11887660027. The reversal of 11887660021 is 12006678811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11887660021 - 2³ = 11887660013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11887660027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13416781 + ... + 13417666.

It is an arithmetic number, because the mean of its divisors is an integer number (2978623728).

Almost surely, 2^11887660021 is an apocalyptic number.

It is an amenable number.

11887660021 is a deficient number, since it is larger than the sum of its proper divisors (26834891).

11887660021 is an equidigital number, since it uses as much as digits as its factorization.

11887660021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26834890.

The product of its (nonzero) digits is 32256, while the sum is 40.

The spelling of 11887660021 in words is "eleven billion, eight hundred eighty-seven million, six hundred sixty thousand, twenty-one".