21380116884 has 144 divisors (see below), whose sum is σ = 58687856640. Its totient is φ = 6039983040.

The previous prime is 21380116883. The next prime is 21380116987. The reversal of 21380116884 is 48861108312.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21380116883) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23468389 + ... + 23469299.

It is an arithmetic number, because the mean of its divisors is an integer number (407554560).

Almost surely, 2^21380116884 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 21380116884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29343928320).

21380116884 is an abundant number, since it is smaller than the sum of its proper divisors (37307739756).

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

21380116884 is a wasteful number, since it uses less digits than its factorization.

21380116884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1338 (or 1329 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 42.

The spelling of 21380116884 in words is "twenty-one billion, three hundred eighty million, one hundred sixteen thousand, eight hundred eighty-four".