21240113433541 has 8 divisors (see below), whose sum is σ = 21501356726304. Its totient is φ = 20978997243600.

The previous prime is 21240113433529. The next prime is 21240113433547. The reversal of 21240113433541 is 14533431104212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21240113433541 - 2²⁹ = 21239576562629 is a prime.

It is a super-2 number, since 2×21240113433541² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21240113433497 and 21240113433506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21240113433547) 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, 31439410 + ... + 32107891.

It is an arithmetic number, because the mean of its divisors is an integer number (2687669590788).

Almost surely, 2^{21240113433541} is an apocalyptic number.

It is an amenable number.

21240113433541 is a deficient number, since it is larger than the sum of its proper divisors (261243292763).

21240113433541 is an equidigital number, since it uses as much as digits as its factorization.

21240113433541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63551411.

The product of its (nonzero) digits is 34560, while the sum is 34.

Adding to 21240113433541 its reverse (14533431104212), we get a palindrome (35773544537753).

The spelling of 21240113433541 in words is "twenty-one trillion, two hundred forty billion, one hundred thirteen million, four hundred thirty-three thousand, five hundred forty-one".