21387799314 has 144 divisors (see below), whose sum is σ = 58707163008. Its totient is φ = 5501067264.

The previous prime is 21387799271. The next prime is 21387799319. The reversal of 21387799314 is 41399778312.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21387799319) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 824754 + ... + 850290.

It is an arithmetic number, because the mean of its divisors is an integer number (407688632).

Almost surely, 2^21387799314 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21387799314, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29353581504).

21387799314 is an abundant number, since it is smaller than the sum of its proper divisors (37319363694).

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

21387799314 is a wasteful number, since it uses less digits than its factorization.

21387799314 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25609 (or 25589 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 54.

The spelling of 21387799314 in words is "twenty-one billion, three hundred eighty-seven million, seven hundred ninety-nine thousand, three hundred fourteen".