20121013001 has 4 divisors (see below), whose sum is σ = 20185711104. Its totient is φ = 20056314900.

The previous prime is 20121012953. The next prime is 20121013037. The reversal of 20121013001 is 10031012102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10031012102 = 2 ⋅5015506051.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20121013001 is a prime.

It is a super-2 number, since 2×20121013001² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20121013501) 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 3 ways as a sum of consecutive naturals, for example, 32348585 + ... + 32349206.

It is an arithmetic number, because the mean of its divisors is an integer number (5046427776).

Almost surely, 2^20121013001 is an apocalyptic number.

It is an amenable number.

20121013001 is a deficient number, since it is larger than the sum of its proper divisors (64698103).

20121013001 is an equidigital number, since it uses as much as digits as its factorization.

20121013001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64698102.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 20121013001 its reverse (10031012102), we get a palindrome (30152025103).

It can be divided in two parts, 2012101 and 3001, that added together give a palindrome (2015102).

The spelling of 20121013001 in words is "twenty billion, one hundred twenty-one million, thirteen thousand, one".