21404421311133 has 24 divisors (see below), whose sum is σ = 33200624891520. Its totient is φ = 12230386613760.

The previous prime is 21404421311111. The next prime is 21404421311171. The reversal of 21404421311133 is 33111312440412.

It is not a de Polignac number, because 21404421311133 - 2⁹ = 21404421310621 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21404421311133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404421311033) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1692228 + ... + 6758141.

It is an arithmetic number, because the mean of its divisors is an integer number (1383359370480).

Almost surely, 2^{21404421311133} is an apocalyptic number.

It is an amenable number.

21404421311133 is a deficient number, since it is larger than the sum of its proper divisors (11796203580387).

21404421311133 is a wasteful number, since it uses less digits than its factorization.

21404421311133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8467617 (or 8467610 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

Adding to 21404421311133 its reverse (33111312440412), we get a palindrome (54515733751545).

The spelling of 21404421311133 in words is "twenty-one trillion, four hundred four billion, four hundred twenty-one million, three hundred eleven thousand, one hundred thirty-three".