21141561101 has 4 divisors (see below), whose sum is σ = 21144141600. Its totient is φ = 21138980604.

The previous prime is 21141561019. The next prime is 21141561137. The reversal of 21141561101 is 10116514112.

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 21141561101 - 2¹⁴ = 21141544717 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 (21141561151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1277921 + ... + 1294358.

It is an arithmetic number, because the mean of its divisors is an integer number (5286035400).

Almost surely, 2^21141561101 is an apocalyptic number.

It is an amenable number.

21141561101 is a deficient number, since it is larger than the sum of its proper divisors (2580499).

21141561101 is an equidigital number, since it uses as much as digits as its factorization.

21141561101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2580498.

The product of its (nonzero) digits is 240, while the sum is 23.

The spelling of 21141561101 in words is "twenty-one billion, one hundred forty-one million, five hundred sixty-one thousand, one hundred one".