21102021111101 has 4 divisors (see below), whose sum is σ = 24116595555552. Its totient is φ = 18087446666652.

The previous prime is 21102021111077. The next prime is 21102021111133. The reversal of 21102021111101 is 10111112020112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21102021111101 - 2⁶ = 21102021111037 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 (21102021111161) 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, 1507287222215 + ... + 1507287222228.

It is an arithmetic number, because the mean of its divisors is an integer number (6029148888888).

Almost surely, 2^{21102021111101} is an apocalyptic number.

It is an amenable number.

21102021111101 is a deficient number, since it is larger than the sum of its proper divisors (3014574444451).

21102021111101 is an equidigital number, since it uses as much as digits as its factorization.

21102021111101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3014574444450.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21102021111101 its reverse (10111112020112), we get a palindrome (31213133131213).

The spelling of 21102021111101 in words is "twenty-one trillion, one hundred two billion, twenty-one million, one hundred eleven thousand, one hundred one".