21411133240 has 128 divisors (see below), whose sum is σ = 55782005760. Its totient is φ = 7244826624.

The previous prime is 21411133199. The next prime is 21411133241. The reversal of 21411133240 is 4233111412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21411133241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9717979 + ... + 9720181.

It is an arithmetic number, because the mean of its divisors is an integer number (435796920).

Almost surely, 2^21411133240 is an apocalyptic number.

21411133240 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 21411133240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27891002880).

21411133240 is an abundant number, since it is smaller than the sum of its proper divisors (34370872520).

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

21411133240 is a wasteful number, since it uses less digits than its factorization.

21411133240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2661 (or 2657 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21411133240 its reverse (4233111412), we get a palindrome (25644244652).

The spelling of 21411133240 in words is "twenty-one billion, four hundred eleven million, one hundred thirty-three thousand, two hundred forty".