21389384192 has 80 divisors (see below), whose sum is σ = 47184917472. Its totient is φ = 9605099520.

The previous prime is 21389384171. The next prime is 21389384227. The reversal of 21389384192 is 29148398312.

It is a super-2 number, since 2×21389384192² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21389384192.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 444578 + ... + 490334.

Almost surely, 2^21389384192 is an apocalyptic number.

21389384192 is a gapful number since it is divisible by the number (22) 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 21389384192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23592458736).

21389384192 is an abundant number, since it is smaller than the sum of its proper divisors (25795533280).

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

21389384192 is an equidigital number, since it uses as much as digits as its factorization.

21389384192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45869 (or 45853 counting only the distinct ones).

The product of its digits is 746496, while the sum is 50.

The spelling of 21389384192 in words is "twenty-one billion, three hundred eighty-nine million, three hundred eighty-four thousand, one hundred ninety-two".