21100001213311 has 4 divisors (see below), whose sum is σ = 21131168128632. Its totient is φ = 21068834297992.

The previous prime is 21100001213273. The next prime is 21100001213413. The reversal of 21100001213311 is 11331210000112.

It is a happy number.

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 21100001213311 - 2²⁹ = 21099464342399 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 (21100001213611) 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, 15583456645 + ... + 15583457998.

It is an arithmetic number, because the mean of its divisors is an integer number (5282792032158).

Almost surely, 2^{21100001213311} is an apocalyptic number.

21100001213311 is a deficient number, since it is larger than the sum of its proper divisors (31166915321).

21100001213311 is an equidigital number, since it uses as much as digits as its factorization.

21100001213311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31166915320.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21100001213311 its reverse (11331210000112), we get a palindrome (32431211213423).

The spelling of 21100001213311 in words is "twenty-one trillion, one hundred billion, one million, two hundred thirteen thousand, three hundred eleven".