20010122111 has 24 divisors (see below), whose sum is σ = 23838108624. Its totient is φ = 16738807680.

The previous prime is 20010122101. The next prime is 20010122117. The reversal of 20010122111 is 11122101002.

It is a de Polignac number, because none of the positive numbers 2^k-20010122111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20010122092 and 20010122101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010122117) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3142571 + ... + 3148931.

It is an arithmetic number, because the mean of its divisors is an integer number (993254526).

Almost surely, 2^20010122111 is an apocalyptic number.

20010122111 is a deficient number, since it is larger than the sum of its proper divisors (3827986513).

20010122111 is a wasteful number, since it uses less digits than its factorization.

20010122111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7911 (or 7904 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20010122111 its reverse (11122101002), we get a palindrome (31132223113).

The spelling of 20010122111 in words is "twenty billion, ten million, one hundred twenty-two thousand, one hundred eleven".