20101212123 has 8 divisors (see below), whose sum is σ = 26823643728. Its totient is φ = 13389794304.

The previous prime is 20101212119. The next prime is 20101212137. The reversal of 20101212123 is 32121210102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20101212123 - 2² = 20101212119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20101212113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2749186 + ... + 2756487.

It is an arithmetic number, because the mean of its divisors is an integer number (3352955466).

Almost surely, 2^20101212123 is an apocalyptic number.

20101212123 is a deficient number, since it is larger than the sum of its proper divisors (6722431605).

20101212123 is a wasteful number, since it uses less digits than its factorization.

20101212123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5506893.

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

Adding to 20101212123 its reverse (32121210102), we get a palindrome (52222422225).

The spelling of 20101212123 in words is "twenty billion, one hundred one million, two hundred twelve thousand, one hundred twenty-three".