21138322814380 has 96 divisors (see below), whose sum is σ = 47866238703360. Its totient is φ = 7815393734400.

The previous prime is 21138322814363. The next prime is 21138322814449. The reversal of 21138322814380 is 8341822383112.

It is a self number, because there is not a number n which added to its sum of digits gives 21138322814380.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14107230 + ... + 15533530.

It is an arithmetic number, because the mean of its divisors is an integer number (498606653160).

Almost surely, 2^{21138322814380} is an apocalyptic number.

21138322814380 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 21138322814380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23933119351680).

21138322814380 is an abundant number, since it is smaller than the sum of its proper divisors (26727915888980).

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

21138322814380 is a wasteful number, since it uses less digits than its factorization.

21138322814380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1427279 (or 1427277 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 46.

The spelling of 21138322814380 in words is "twenty-one trillion, one hundred thirty-eight billion, three hundred twenty-two million, eight hundred fourteen thousand, three hundred eighty".