21182685941 has 4 divisors (see below), whose sum is σ = 21212563500. Its totient is φ = 21152808384.

The previous prime is 21182685893. The next prime is 21182685943. The reversal of 21182685941 is 14958628112.

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 11953048900 + 9229637041 = 109330^2 + 96071^2 .

It is a cyclic number.

It is not a de Polignac number, because 21182685941 - 2⁶ = 21182685877 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 (21182685943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14937716 + ... + 14939133.

It is an arithmetic number, because the mean of its divisors is an integer number (5303140875).

Almost surely, 2^21182685941 is an apocalyptic number.

It is an amenable number.

21182685941 is a deficient number, since it is larger than the sum of its proper divisors (29877559).

21182685941 is an equidigital number, since it uses as much as digits as its factorization.

21182685941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29877558.

The product of its digits is 276480, while the sum is 47.

The spelling of 21182685941 in words is "twenty-one billion, one hundred eighty-two million, six hundred eighty-five thousand, nine hundred forty-one".