21124233240 has 192 divisors, whose sum is σ = 69972789600. Its totient is φ = 5097861120.

The previous prime is 21124233233. The next prime is 21124233253. The reversal of 21124233240 is 4233242112.

It is a happy number.

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 21124233240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3321904 + ... + 3328256.

Almost surely, 2^21124233240 is an apocalyptic number.

21124233240 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 21124233240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34986394800).

21124233240 is an abundant number, since it is smaller than the sum of its proper divisors (48848556360).

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

21124233240 is a wasteful number, since it uses less digits than its factorization.

21124233240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6618 (or 6603 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21124233240 its reverse (4233242112), we get a palindrome (25357475352).

The spelling of 21124233240 in words is "twenty-one billion, one hundred twenty-four million, two hundred thirty-three thousand, two hundred forty".