21938377696 has 48 divisors (see below), whose sum is σ = 44120613600. Its totient is φ = 10734958080.

The previous prime is 21938377679. The next prime is 21938377697. The reversal of 21938377696 is 69677383912.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21938377697) 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, 360210 + ... + 416686.

It is an arithmetic number, because the mean of its divisors is an integer number (919179450).

Almost surely, 2^21938377696 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21938377696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22060306800).

21938377696 is an abundant number, since it is smaller than the sum of its proper divisors (22182235904).

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

21938377696 is a wasteful number, since it uses less digits than its factorization.

21938377696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56747 (or 56739 counting only the distinct ones).

The product of its digits is 20575296, while the sum is 61.

The spelling of 21938377696 in words is "twenty-one billion, nine hundred thirty-eight million, three hundred seventy-seven thousand, six hundred ninety-six".