21321231101311 has 4 divisors (see below), whose sum is σ = 22575421166112. Its totient is φ = 20067041036512.

The previous prime is 21321231101197. The next prime is 21321231101323. The reversal of 21321231101311 is 11310113212312.

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

It is a cyclic number.

It is not a de Polignac number, because 21321231101311 - 2³⁵ = 21286871362943 is a prime.

It is a super-2 number, since 2×21321231101311² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321231104311) 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, 627095032375 + ... + 627095032408.

It is an arithmetic number, because the mean of its divisors is an integer number (5643855291528).

Almost surely, 2^{21321231101311} is an apocalyptic number.

21321231101311 is a deficient number, since it is larger than the sum of its proper divisors (1254190064801).

21321231101311 is a wasteful number, since it uses less digits than its factorization.

21321231101311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1254190064800.

The product of its (nonzero) digits is 216, while the sum is 22.

Adding to 21321231101311 its reverse (11310113212312), we get a palindrome (32631344313623).

The spelling of 21321231101311 in words is "twenty-one trillion, three hundred twenty-one billion, two hundred thirty-one million, one hundred one thousand, three hundred eleven".