21645311411 has 8 divisors (see below), whose sum is σ = 22077067104. Its totient is φ = 21217080640.

The previous prime is 21645311407. The next prime is 21645311447. The reversal of 21645311411 is 11411354612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21645311411 - 2² = 21645311407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21645311911) 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 7 ways as a sum of consecutive naturals, for example, 868826 + ... + 893391.

It is an arithmetic number, because the mean of its divisors is an integer number (2759633388).

Almost surely, 2^21645311411 is an apocalyptic number.

21645311411 is a deficient number, since it is larger than the sum of its proper divisors (431755693).

21645311411 is a wasteful number, since it uses less digits than its factorization.

21645311411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1762461.

The product of its digits is 2880, while the sum is 29.

The spelling of 21645311411 in words is "twenty-one billion, six hundred forty-five million, three hundred eleven thousand, four hundred eleven".