21533421104311 has 4 divisors (see below), whose sum is σ = 21533431416400. Its totient is φ = 21533410792224.

The previous prime is 21533421104297. The next prime is 21533421104317. The reversal of 21533421104311 is 11340112433512.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21533421104311 - 2³³ = 21524831169719 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 (21533421104317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 793266 + ... + 6610303.

It is an arithmetic number, because the mean of its divisors is an integer number (5383357854100).

Almost surely, 2^{21533421104311} is an apocalyptic number.

21533421104311 is a deficient number, since it is larger than the sum of its proper divisors (10312089).

21533421104311 is an equidigital number, since it uses as much as digits as its factorization.

21533421104311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10312088.

The product of its (nonzero) digits is 8640, while the sum is 31.

Adding to 21533421104311 its reverse (11340112433512), we get a palindrome (32873533537823).

The spelling of 21533421104311 in words is "twenty-one trillion, five hundred thirty-three billion, four hundred twenty-one million, one hundred four thousand, three hundred eleven".