21433111440 has 160 divisors (see below), whose sum is σ = 71918896896. Its totient is φ = 5248911360.

The previous prime is 21433111391. The next prime is 21433111477. The reversal of 21433111440 is 4411133412.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21433111440.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 597205 + ... + 632075.

Almost surely, 2^21433111440 is an apocalyptic number.

21433111440 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 21433111440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35959448448).

21433111440 is an abundant number, since it is smaller than the sum of its proper divisors (50485785456).

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

21433111440 is a wasteful number, since it uses less digits than its factorization.

21433111440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35097 (or 35091 counting only the distinct ones).

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

Adding to 21433111440 its reverse (4411133412), we get a palindrome (25844244852).

The spelling of 21433111440 in words is "twenty-one billion, four hundred thirty-three million, one hundred eleven thousand, four hundred forty".