21505353120541 has 8 divisors (see below), whose sum is σ = 22441436398080. Its totient is φ = 20569358836752.

The previous prime is 21505353120473. The next prime is 21505353120551. The reversal of 21505353120541 is 14502135350512.

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

It is not a de Polignac number, because 21505353120541 - 2¹⁷ = 21505352989469 is a prime.

It is a super-2 number, since 2×21505353120541² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21505353120541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21505353120551) 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, 21754386 + ... + 22721443.

It is an arithmetic number, because the mean of its divisors is an integer number (2805179549760).

Almost surely, 2^{21505353120541} is an apocalyptic number.

It is an amenable number.

21505353120541 is a deficient number, since it is larger than the sum of its proper divisors (936083277539).

21505353120541 is a wasteful number, since it uses less digits than its factorization.

21505353120541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44496875.

The product of its (nonzero) digits is 90000, while the sum is 37.

The spelling of 21505353120541 in words is "twenty-one trillion, five hundred five billion, three hundred fifty-three million, one hundred twenty thousand, five hundred forty-one".