21391140000 has 240 divisors, whose sum is σ = 70403588640. Its totient is φ = 5685120000.

The previous prime is 21391139989. The next prime is 21391140031. The reversal of 21391140000 is 4119312.

It is a tau number, because it is divible by the number of its divisors (240).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 32459671 + ... + 32460329.

It is an arithmetic number, because the mean of its divisors is an integer number (293348286).

Almost surely, 2^21391140000 is an apocalyptic number.

21391140000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21391140000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35201794320).

21391140000 is an abundant number, since it is smaller than the sum of its proper divisors (49012448640).

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

21391140000 is an equidigital number, since it uses as much as digits as its factorization.

21391140000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1233 (or 1210 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 21391140000 its reverse (4119312), we get a palindrome (21395259312).

The spelling of 21391140000 in words is "twenty-one billion, three hundred ninety-one million, one hundred forty thousand".