21326986878 has 8 divisors (see below), whose sum is σ = 42653973768. Its totient is φ = 7108995624.

The previous prime is 21326986817. The next prime is 21326987021. The reversal of 21326986878 is 87868962312.

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

21326986878 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1777248901 + ... + 1777248912.

It is an arithmetic number, because the mean of its divisors is an integer number (5331746721).

Almost surely, 2^21326986878 is an apocalyptic number.

21326986878 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21326986878 is a wasteful number, since it uses less digits than its factorization.

21326986878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3554497818.

The product of its digits is 13934592, while the sum is 60.

The spelling of 21326986878 in words is "twenty-one billion, three hundred twenty-six million, nine hundred eighty-six thousand, eight hundred seventy-eight".