21888673866 has 24 divisors (see below), whose sum is σ = 47429613504. Its totient is φ = 7295585640.

The previous prime is 21888673847. The next prime is 21888673871. The reversal of 21888673866 is 66837688812.

It is a super-2 number, since 2×21888673866² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 187381 + ... + 280871.

It is an arithmetic number, because the mean of its divisors is an integer number (1976233896).

Almost surely, 2^21888673866 is an apocalyptic number.

21888673866 is an abundant number, since it is smaller than the sum of its proper divisors (25540939638).

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

21888673866 is a wasteful number, since it uses less digits than its factorization.

21888673866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106506 (or 106503 counting only the distinct ones).

The product of its digits is 37158912, while the sum is 63.

The spelling of 21888673866 in words is "twenty-one billion, eight hundred eighty-eight million, six hundred seventy-three thousand, eight hundred sixty-six".