20120122111 has 4 divisors (see below), whose sum is σ = 20127339000. Its totient is φ = 20112905224.

The previous prime is 20120122079. The next prime is 20120122147. The reversal of 20120122111 is 11122102102.

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

It is a cyclic number.

It is not a de Polignac number, because 20120122111 - 2⁵ = 20120122079 is a prime.

It is a super-3 number, since 3×20120122111³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20120122091 and 20120122100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120122151) 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, 3604261 + ... + 3609838.

It is an arithmetic number, because the mean of its divisors is an integer number (5031834750).

Almost surely, 2^20120122111 is an apocalyptic number.

20120122111 is a deficient number, since it is larger than the sum of its proper divisors (7216889).

20120122111 is an equidigital number, since it uses as much as digits as its factorization.

20120122111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7216888.

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

Adding to 20120122111 its reverse (11122102102), we get a palindrome (31242224213).

The spelling of 20120122111 in words is "twenty billion, one hundred twenty million, one hundred twenty-two thousand, one hundred eleven".