20101102123 has 4 divisors (see below), whose sum is σ = 20101395168. Its totient is φ = 20100809080.

The previous prime is 20101102121. The next prime is 20101102163. The reversal of 20101102123 is 32120110102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20101102123 - 2¹ = 20101102121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20101102121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17790 + ... + 201292.

It is an arithmetic number, because the mean of its divisors is an integer number (5025348792).

Almost surely, 2^20101102123 is an apocalyptic number.

20101102123 is a deficient number, since it is larger than the sum of its proper divisors (293045).

20101102123 is a wasteful number, since it uses less digits than its factorization.

20101102123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293044.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 20101102123 its reverse (32120110102), we get a palindrome (52221212225).

The spelling of 20101102123 in words is "twenty billion, one hundred one million, one hundred two thousand, one hundred twenty-three".