21311102132011 has 4 divisors (see below), whose sum is σ = 22045967722800. Its totient is φ = 20576236541224.

The previous prime is 21311102131993. The next prime is 21311102132027. The reversal of 21311102132011 is 11023120111312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21311102132011 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 21311102132011.

It is not an unprimeable number, because it can be changed into a prime (21311102132041) 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, 367432795351 + ... + 367432795408.

It is an arithmetic number, because the mean of its divisors is an integer number (5511491930700).

Almost surely, 2^{21311102132011} is an apocalyptic number.

21311102132011 is a deficient number, since it is larger than the sum of its proper divisors (734865590789).

21311102132011 is an equidigital number, since it uses as much as digits as its factorization.

21311102132011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734865590788.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 21311102132011 its reverse (11023120111312), we get a palindrome (32334222243323).

The spelling of 21311102132011 in words is "twenty-one trillion, three hundred eleven billion, one hundred two million, one hundred thirty-two thousand, eleven".