21064791882 has 16 divisors (see below), whose sum is σ = 42195111840. Its totient is φ = 7010675952.

The previous prime is 21064791871. The next prime is 21064791887. The reversal of 21064791882 is 28819746012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21064791887) 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, 2726157 + ... + 2733872.

It is an arithmetic number, because the mean of its divisors is an integer number (2637194490).

Almost surely, 2^21064791882 is an apocalyptic number.

21064791882 is an abundant number, since it is smaller than the sum of its proper divisors (21130319958).

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

21064791882 is a wasteful number, since it uses less digits than its factorization.

21064791882 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5460677.

The product of its (nonzero) digits is 387072, while the sum is 48.

The spelling of 21064791882 in words is "twenty-one billion, sixty-four million, seven hundred ninety-one thousand, eight hundred eighty-two".