21688089474 has 8 divisors (see below), whose sum is σ = 43376178960. Its totient is φ = 7229363156.

The previous prime is 21688089461. The next prime is 21688089503. The reversal of 21688089474 is 47498088612.

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

21688089474 is an admirable 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, 1807340784 + ... + 1807340795.

It is an arithmetic number, because the mean of its divisors is an integer number (5422022370).

Almost surely, 2^21688089474 is an apocalyptic number.

21688089474 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.

21688089474 is a wasteful number, since it uses less digits than its factorization.

21688089474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3614681584.

The product of its (nonzero) digits is 6193152, while the sum is 57.

The spelling of 21688089474 in words is "twenty-one billion, six hundred eighty-eight million, eighty-nine thousand, four hundred seventy-four".