21541023053013 has 4 divisors (see below), whose sum is σ = 28721364070688. Its totient is φ = 14360682035340.

The previous prime is 21541023053003. The next prime is 21541023053021. The reversal of 21541023053013 is 31035032014512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21541023053013 - 2⁵ = 21541023052981 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 (21541023053003) 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, 3590170508833 + ... + 3590170508838.

It is an arithmetic number, because the mean of its divisors is an integer number (7180341017672).

Almost surely, 2^{21541023053013} is an apocalyptic number.

It is an amenable number.

21541023053013 is a deficient number, since it is larger than the sum of its proper divisors (7180341017675).

21541023053013 is an equidigital number, since it uses as much as digits as its factorization.

21541023053013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7180341017674.

The product of its (nonzero) digits is 10800, while the sum is 30.

Adding to 21541023053013 its reverse (31035032014512), we get a palindrome (52576055067525).

The spelling of 21541023053013 in words is "twenty-one trillion, five hundred forty-one billion, twenty-three million, fifty-three thousand, thirteen".