21112110101 has 4 divisors (see below), whose sum is σ = 21136574592. Its totient is φ = 21087645612.

The previous prime is 21112110037. The next prime is 21112110109. The reversal of 21112110101 is 10101121112.

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 21112110101 - 2⁶ = 21112110037 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 (21112110109) 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, 12230951 + ... + 12232676.

It is an arithmetic number, because the mean of its divisors is an integer number (5284143648).

Almost surely, 2^21112110101 is an apocalyptic number.

It is an amenable number.

21112110101 is a deficient number, since it is larger than the sum of its proper divisors (24464491).

21112110101 is an equidigital number, since it uses as much as digits as its factorization.

21112110101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24464490.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21112110101 its reverse (10101121112), we get a palindrome (31213231213).

The spelling of 21112110101 in words is "twenty-one billion, one hundred twelve million, one hundred ten thousand, one hundred one".