20121223101 has 16 divisors (see below), whose sum is σ = 31993995264. Its totient is φ = 10997935344.

The previous prime is 20121223051. The next prime is 20121223123. The reversal of 20121223101 is 10132212102.

It is not a de Polignac number, because 20121223101 - 2¹⁴ = 20121206717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121223201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20828941 + ... + 20829906.

It is an arithmetic number, because the mean of its divisors is an integer number (1999624704).

Almost surely, 2^20121223101 is an apocalyptic number.

20121223101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20121223101 is a deficient number, since it is larger than the sum of its proper divisors (11872772163).

20121223101 is a wasteful number, since it uses less digits than its factorization.

20121223101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41658880.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 20121223101 its reverse (10132212102), we get a palindrome (30253435203).

The spelling of 20121223101 in words is "twenty billion, one hundred twenty-one million, two hundred twenty-three thousand, one hundred one".