21887211186 has 12 divisors (see below), whose sum is σ = 47422290942. Its totient is φ = 7295737056.

The previous prime is 21887211149. The next prime is 21887211211. The reversal of 21887211186 is 68111278812.

It can be written as a sum of positive squares in only one way, i.e., 21087396225 + 799814961 = 145215^2 + 28281^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 607978071 + ... + 607978106.

Almost surely, 2^21887211186 is an apocalyptic number.

21887211186 is an abundant number, since it is smaller than the sum of its proper divisors (25535079756).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21887211186 is a wasteful number, since it uses less digits than its factorization.

21887211186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215956185 (or 1215956182 counting only the distinct ones).

The product of its digits is 86016, while the sum is 45.

Adding to 21887211186 its reverse (68111278812), we get a palindrome (89998489998).

The spelling of 21887211186 in words is "twenty-one billion, eight hundred eighty-seven million, two hundred eleven thousand, one hundred eighty-six".