21111201111331 has 4 divisors (see below), whose sum is σ = 21204201997512. Its totient is φ = 21018200225152.

The previous prime is 21111201111311. The next prime is 21111201111361. The reversal of 21111201111331 is 13311110211112.

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 21111201111331 - 2³⁵ = 21076841372963 is a prime.

It is a super-2 number, since 2×21111201111331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21111201111299 and 21111201111308.

It is not an unprimeable number, because it can be changed into a prime (21111201111311) 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, 46500442750 + ... + 46500443203.

It is an arithmetic number, because the mean of its divisors is an integer number (5301050499378).

Almost surely, 2^{21111201111331} is an apocalyptic number.

21111201111331 is a deficient number, since it is larger than the sum of its proper divisors (93000886181).

21111201111331 is an equidigital number, since it uses as much as digits as its factorization.

21111201111331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93000886180.

The product of its (nonzero) digits is 36, while the sum is 19.

Adding to 21111201111331 its reverse (13311110211112), we get a palindrome (34422311322443).

The spelling of 21111201111331 in words is "twenty-one trillion, one hundred eleven billion, two hundred one million, one hundred eleven thousand, three hundred thirty-one".