21187107579 has 8 divisors (see below), whose sum is σ = 30817611072. Its totient is φ = 12840671240.

The previous prime is 21187107577. The next prime is 21187107587. The reversal of 21187107579 is 97570178112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21187107579 - 2¹ = 21187107577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21187107577) 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 7 ways as a sum of consecutive naturals, for example, 321016749 + ... + 321016814.

It is an arithmetic number, because the mean of its divisors is an integer number (3852201384).

Almost surely, 2^21187107579 is an apocalyptic number.

21187107579 is a deficient number, since it is larger than the sum of its proper divisors (9630503493).

21187107579 is a wasteful number, since it uses less digits than its factorization.

21187107579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642033577.

The product of its (nonzero) digits is 246960, while the sum is 48.

The spelling of 21187107579 in words is "twenty-one billion, one hundred eighty-seven million, one hundred seven thousand, five hundred seventy-nine".