20112122101 has 4 divisors (see below), whose sum is σ = 20138691052. Its totient is φ = 20085553152.

The previous prime is 20112122099. The next prime is 20112122111. The reversal of 20112122101 is 10122121102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10998555876 + 9113566225 = 104874^2 + 95465^2 .

It is a cyclic number.

It is not a de Polignac number, because 20112122101 - 2¹ = 20112122099 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 (20112122111) 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, 13283340 + ... + 13284853.

It is an arithmetic number, because the mean of its divisors is an integer number (5034672763).

Almost surely, 2^20112122101 is an apocalyptic number.

It is an amenable number.

20112122101 is a deficient number, since it is larger than the sum of its proper divisors (26568951).

20112122101 is an equidigital number, since it uses as much as digits as its factorization.

20112122101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26568950.

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

Adding to 20112122101 its reverse (10122121102), we get a palindrome (30234243203).

Subtracting from 20112122101 its reverse (10122121102), we obtain a palindrome (9990000999).

The spelling of 20112122101 in words is "twenty billion, one hundred twelve million, one hundred twenty-two thousand, one hundred one".