21311119110101 has 4 divisors (see below), whose sum is σ = 21358582627500. Its totient is φ = 21263655592704.

The previous prime is 21311119110097. The next prime is 21311119110161. The reversal of 21311119110101 is 10101191111312.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16979097124900 + 4332021985201 = 4120570^2 + 2081351^2 .

It is a cyclic number.

It is not a de Polignac number, because 21311119110101 - 2² = 21311119110097 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 (21311119110161) 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, 23731758026 + ... + 23731758923.

It is an arithmetic number, because the mean of its divisors is an integer number (5339645656875).

Almost surely, 2^{21311119110101} is an apocalyptic number.

It is an amenable number.

21311119110101 is a deficient number, since it is larger than the sum of its proper divisors (47463517399).

21311119110101 is an equidigital number, since it uses as much as digits as its factorization.

21311119110101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47463517398.

The product of its (nonzero) digits is 54, while the sum is 23.

The spelling of 21311119110101 in words is "twenty-one trillion, three hundred eleven billion, one hundred nineteen million, one hundred ten thousand, one hundred one".