21113024440 has 16 divisors (see below), whose sum is σ = 47504305080. Its totient is φ = 8445209760.

The previous prime is 21113024431. The next prime is 21113024441. The reversal of 21113024440 is 4442031112.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113024441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 263912766 + ... + 263912845.

Almost surely, 2^21113024440 is an apocalyptic number.

21113024440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21113024440 is an abundant number, since it is smaller than the sum of its proper divisors (26391280640).

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

21113024440 is a wasteful number, since it uses less digits than its factorization.

21113024440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527825622 (or 527825618 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21113024440 its reverse (4442031112), we get a palindrome (25555055552).

The spelling of 21113024440 in words is "twenty-one billion, one hundred thirteen million, twenty-four thousand, four hundred forty".