21889542312 has 192 divisors, whose sum is σ = 69419151360. Its totient is φ = 6157209600.

The previous prime is 21889542293. The next prime is 21889542317. The reversal of 21889542312 is 21324598812.

21889542312 is a `hidden beast` number, since 2 + 18 + 89 + 542 + 3 + 12 = 666.

It is not an unprimeable number, because it can be changed into a prime (21889542317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 971737 + ... + 994007.

It is an arithmetic number, because the mean of its divisors is an integer number (361558080).

Almost surely, 2^21889542312 is an apocalyptic number.

21889542312 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 21889542312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34709575680).

21889542312 is an abundant number, since it is smaller than the sum of its proper divisors (47529609048).

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

21889542312 is a wasteful number, since it uses less digits than its factorization.

21889542312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22384 (or 22377 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The spelling of 21889542312 in words is "twenty-one billion, eight hundred eighty-nine million, five hundred forty-two thousand, three hundred twelve".