20121122101 has 4 divisors (see below), whose sum is σ = 20121501600. Its totient is φ = 20120742604.

The previous prime is 20121122059. The next prime is 20121122111. The reversal of 20121122101 is 10122112102.

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 20121122101 - 2²⁹ = 19584251189 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 (20121122111) 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, 94171 + ... + 221608.

It is an arithmetic number, because the mean of its divisors is an integer number (5030375400).

Almost surely, 2^20121122101 is an apocalyptic number.

It is an amenable number.

20121122101 is a deficient number, since it is larger than the sum of its proper divisors (379499).

20121122101 is an equidigital number, since it uses as much as digits as its factorization.

20121122101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379498.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20121122101 its reverse (10122112102), we get a palindrome (30243234203).

Subtracting from 20121122101 its reverse (10122112102), we obtain a palindrome (9999009999).

The spelling of 20121122101 in words is "twenty billion, one hundred twenty-one million, one hundred twenty-two thousand, one hundred one".