21101000212111 has 4 divisors (see below), whose sum is σ = 21146574727072. Its totient is φ = 21055425697152.

The previous prime is 21101000212093. The next prime is 21101000212129. The reversal of 21101000212111 is 11121200010112.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (21101000212093) and next prime (21101000212129).

It is a cyclic number.

It is not a de Polignac number, because 21101000212111 - 2³⁵ = 21066640473743 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21101000212091 and 21101000212100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101007212111) 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, 22787256786 + ... + 22787257711.

It is an arithmetic number, because the mean of its divisors is an integer number (5286643681768).

Almost surely, 2^{21101000212111} is an apocalyptic number.

21101000212111 is a deficient number, since it is larger than the sum of its proper divisors (45574514961).

21101000212111 is an equidigital number, since it uses as much as digits as its factorization.

21101000212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45574514960.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21101000212111 its reverse (11121200010112), we get a palindrome (32222200222223).

The spelling of 21101000212111 in words is "twenty-one trillion, one hundred one billion, two hundred twelve thousand, one hundred eleven".