21887407166 has 4 divisors (see below), whose sum is σ = 32831110752. Its totient is φ = 10943703582.

The previous prime is 21887407151. The next prime is 21887407189. The reversal of 21887407166 is 66170478812.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5471851790 + ... + 5471851793.

It is an arithmetic number, because the mean of its divisors is an integer number (8207777688).

Almost surely, 2^21887407166 is an apocalyptic number.

21887407166 is a deficient number, since it is larger than the sum of its proper divisors (10943703586).

21887407166 is a wasteful number, since it uses less digits than its factorization.

21887407166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10943703585.

The product of its (nonzero) digits is 903168, while the sum is 50.

The spelling of 21887407166 in words is "twenty-one billion, eight hundred eighty-seven million, four hundred seven thousand, one hundred sixty-six".