21000113013541 has 4 divisors (see below), whose sum is σ = 21001297003372. Its totient is φ = 20998929023712.

The previous prime is 21000113013499. The next prime is 21000113013577. The reversal of 21000113013541 is 14531031100012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11991530968641 + 9008582044900 = 3462879^2 + 3001430^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000113013541 - 2³³ = 20991523078949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000113053541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 591968310 + ... + 592003783.

It is an arithmetic number, because the mean of its divisors is an integer number (5250324250843).

Almost surely, 2^{21000113013541} is an apocalyptic number.

It is an amenable number.

21000113013541 is a deficient number, since it is larger than the sum of its proper divisors (1183989831).

21000113013541 is a wasteful number, since it uses less digits than its factorization.

21000113013541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1183989830.

The product of its (nonzero) digits is 360, while the sum is 22.

Adding to 21000113013541 its reverse (14531031100012), we get a palindrome (35531144113553).

The spelling of 21000113013541 in words is "twenty-one trillion, one hundred thirteen million, thirteen thousand, five hundred forty-one".