21113332240 has 480 divisors, whose sum is σ = 70228290816. Its totient is φ = 5712445440.

The previous prime is 21113332169. The next prime is 21113332249. The reversal of 21113332240 is 4223331112.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (21113332249) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 17697084 + ... + 17698276.

Almost surely, 2^21113332240 is an apocalyptic number.

21113332240 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 21113332240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35114145408).

21113332240 is an abundant number, since it is smaller than the sum of its proper divisors (49114958576).

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

21113332240 is a wasteful number, since it uses less digits than its factorization.

21113332240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1267 (or 1248 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21113332240 its reverse (4223331112), we get a palindrome (25336663352).

It can be divided in two parts, 21113 and 332240, that added together give a palindrome (353353).

The spelling of 21113332240 in words is "twenty-one billion, one hundred thirteen million, three hundred thirty-two thousand, two hundred forty".