21542041335131 has 4 divisors (see below), whose sum is σ = 21545305782000. Its totient is φ = 21538776888264.

The previous prime is 21542041335083. The next prime is 21542041335193. The reversal of 21542041335131 is 13153314024512.

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

It is a cyclic number.

It is not a de Polignac number, because 21542041335131 - 2³⁰ = 21540967593307 is a prime.

It is a super-2 number, since 2×21542041335131² (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 = 21542041335091 and 21542041335100.

It is not an unprimeable number, because it can be changed into a prime (21542041395131) 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, 1632213536 + ... + 1632226733.

It is an arithmetic number, because the mean of its divisors is an integer number (5386326445500).

Almost surely, 2^{21542041335131} is an apocalyptic number.

21542041335131 is a deficient number, since it is larger than the sum of its proper divisors (3264446869).

21542041335131 is an equidigital number, since it uses as much as digits as its factorization.

21542041335131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3264446868.

The product of its (nonzero) digits is 43200, while the sum is 35.

Adding to 21542041335131 its reverse (13153314024512), we get a palindrome (34695355359643).

The spelling of 21542041335131 in words is "twenty-one trillion, five hundred forty-two billion, forty-one million, three hundred thirty-five thousand, one hundred thirty-one".