21365880411 has 4 divisors (see below), whose sum is σ = 28487840552. Its totient is φ = 14243920272.

The previous prime is 21365880391. The next prime is 21365880421. The reversal of 21365880411 is 11408856312.

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

It is not a de Polignac number, because 21365880411 - 2¹³ = 21365872219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21365880411.

It is not an unprimeable number, because it can be changed into a prime (21365880421) 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, 3560980066 + ... + 3560980071.

It is an arithmetic number, because the mean of its divisors is an integer number (7121960138).

Almost surely, 2^21365880411 is an apocalyptic number.

21365880411 is a deficient number, since it is larger than the sum of its proper divisors (7121960141).

21365880411 is an equidigital number, since it uses as much as digits as its factorization.

21365880411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7121960140.

The product of its (nonzero) digits is 46080, while the sum is 39.

The spelling of 21365880411 in words is "twenty-one billion, three hundred sixty-five million, eight hundred eighty thousand, four hundred eleven".