20121312101 has 8 divisors (see below), whose sum is σ = 22214987424. Its totient is φ = 18071714320.

The previous prime is 20121312089. The next prime is 20121312137. The reversal of 20121312101 is 10121312102.

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

It is not a de Polignac number, because 20121312101 - 2²⁶ = 20054203237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121312191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11018426 + ... + 11020251.

It is an arithmetic number, because the mean of its divisors is an integer number (2776873428).

Almost surely, 2^20121312101 is an apocalyptic number.

It is an amenable number.

20121312101 is a deficient number, since it is larger than the sum of its proper divisors (2093675323).

20121312101 is a wasteful number, since it uses less digits than its factorization.

20121312101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22038771.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 20121312101 its reverse (10121312102), we get a palindrome (30242624203).

Subtracting from 20121312101 its reverse (10121312102), we obtain a palindrome (9999999999).

The spelling of 20121312101 in words is "twenty billion, one hundred twenty-one million, three hundred twelve thousand, one hundred one".