21155141155441 has 4 divisors (see below), whose sum is σ = 21513702870000. Its totient is φ = 20796579440884.

The previous prime is 21155141155433. The next prime is 21155141155469. The reversal of 21155141155441 is 14455114155112.

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 a cyclic number.

It is not a de Polignac number, because 21155141155441 - 2³ = 21155141155433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21155141155394 and 21155141155403.

It is not an unprimeable number, because it can be changed into a prime (21155141155241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179280857191 + ... + 179280857308.

It is an arithmetic number, because the mean of its divisors is an integer number (5378425717500).

Almost surely, 2^{21155141155441} is an apocalyptic number.

It is an amenable number.

21155141155441 is a deficient number, since it is larger than the sum of its proper divisors (358561714559).

21155141155441 is an equidigital number, since it uses as much as digits as its factorization.

21155141155441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358561714558.

The product of its digits is 80000, while the sum is 40.

The spelling of 21155141155441 in words is "twenty-one trillion, one hundred fifty-five billion, one hundred forty-one million, one hundred fifty-five thousand, four hundred forty-one".