21311411223421 has 8 divisors (see below), whose sum is σ = 23642859909600. Its totient is φ = 19045637148240.

The previous prime is 21311411223383. The next prime is 21311411223437. The reversal of 21311411223421 is 12432211411312.

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 21311411223421 - 2¹⁹ = 21311410699133 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 21311411223421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311411223461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16418652066 + ... + 16418653363.

It is an arithmetic number, because the mean of its divisors is an integer number (2955357488700).

Almost surely, 2^{21311411223421} is an apocalyptic number.

It is an amenable number.

21311411223421 is a deficient number, since it is larger than the sum of its proper divisors (2331448686179).

21311411223421 is a wasteful number, since it uses less digits than its factorization.

21311411223421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32837305499.

The product of its digits is 2304, while the sum is 28.

Adding to 21311411223421 its reverse (12432211411312), we get a palindrome (33743622634733).

The spelling of 21311411223421 in words is "twenty-one trillion, three hundred eleven billion, four hundred eleven million, two hundred twenty-three thousand, four hundred twenty-one".