21033234240 has 112 divisors (see below), whose sum is σ = 67290696000. Its totient is φ = 5566013440.

The previous prime is 21033234239. The next prime is 21033234307. The reversal of 21033234240 is 4243233012.

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 21033234240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42136 + ... + 209384.

Almost surely, 2^21033234240 is an apocalyptic number.

21033234240 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 21033234240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33645348000).

21033234240 is an abundant number, since it is smaller than the sum of its proper divisors (46257461760).

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

21033234240 is a wasteful number, since it uses less digits than its factorization.

21033234240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167400 (or 167390 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 24.

Adding to 21033234240 its reverse (4243233012), we get a palindrome (25276467252).

The spelling of 21033234240 in words is "twenty-one billion, thirty-three million, two hundred thirty-four thousand, two hundred forty".