21533101325240 has 32 divisors (see below), whose sum is σ = 48449631185280. Its totient is φ = 8613213293952.

The previous prime is 21533101325231. The next prime is 21533101325243. The reversal of 21533101325240 is 4252310133512.

It is a super-2 number, since 2×21533101325240² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21533101325197 and 21533101325206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21533101325243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16148462 + ... + 17430978.

It is an arithmetic number, because the mean of its divisors is an integer number (1514050974540).

Almost surely, 2^{21533101325240} is an apocalyptic number.

21533101325240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21533101325240 is an abundant number, since it is smaller than the sum of its proper divisors (26916529860040).

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

21533101325240 is a wasteful number, since it uses less digits than its factorization.

21533101325240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1702271 (or 1702267 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

Adding to 21533101325240 its reverse (4252310133512), we get a palindrome (25785411458752).

The spelling of 21533101325240 in words is "twenty-one trillion, five hundred thirty-three billion, one hundred one million, three hundred twenty-five thousand, two hundred forty".