21380217348 has 96 divisors (see below), whose sum is σ = 60408633600. Its totient is φ = 5745401856.

The previous prime is 21380217337. The next prime is 21380217371. The reversal of 21380217348 is 84371208312.

It is a super-2 number, since 2×21380217348² (a number of 21 digits) contains 22 as substring.

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, 2550508 + ... + 2558876.

It is an arithmetic number, because the mean of its divisors is an integer number (629256600).

Almost surely, 2^21380217348 is an apocalyptic number.

21380217348 is a gapful number since it is divisible by the number (28) 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 21380217348, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30204316800).

21380217348 is an abundant number, since it is smaller than the sum of its proper divisors (39028416252).

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

21380217348 is a wasteful number, since it uses less digits than its factorization.

21380217348 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10189 (or 10187 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The spelling of 21380217348 in words is "twenty-one billion, three hundred eighty million, two hundred seventeen thousand, three hundred forty-eight".