21112134432 has 48 divisors (see below), whose sum is σ = 56120883840. Its totient is φ = 6948294912.

The previous prime is 21112134413. The next prime is 21112134457. The reversal of 21112134432 is 23443121112.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

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, 1384303 + ... + 1399470.

It is an arithmetic number, because the mean of its divisors is an integer number (1169185080).

Almost surely, 2^21112134432 is an apocalyptic number.

It is an amenable number.

21112134432 is an abundant number, since it is smaller than the sum of its proper divisors (35008749408).

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

21112134432 is a wasteful number, since it uses less digits than its factorization.

21112134432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2783865 (or 2783857 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

Adding to 21112134432 its reverse (23443121112), we get a palindrome (44555255544).

The spelling of 21112134432 in words is "twenty-one billion, one hundred twelve million, one hundred thirty-four thousand, four hundred thirty-two".