21887086678 has 16 divisors (see below), whose sum is σ = 32886453600. Its totient is φ = 10924952896.

The previous prime is 21887086673. The next prime is 21887086691. The reversal of 21887086678 is 87668078812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21887086673) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3739098 + ... + 3744946.

It is an arithmetic number, because the mean of its divisors is an integer number (2055403350).

Almost surely, 2^21887086678 is an apocalyptic number.

21887086678 is a deficient number, since it is larger than the sum of its proper divisors (10999366922).

21887086678 is a wasteful number, since it uses less digits than its factorization.

21887086678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8711.

The product of its (nonzero) digits is 14450688, while the sum is 61.

The spelling of 21887086678 in words is "twenty-one billion, eight hundred eighty-seven million, eighty-six thousand, six hundred seventy-eight".