20010120211001 has 4 divisors (see below), whose sum is σ = 20012087978100. Its totient is φ = 20008152443904.

The previous prime is 20010120210967. The next prime is 20010120211007. The reversal of 20010120211001 is 10011202101002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12983915022400 + 7026205188601 = 3603320^2 + 2650699^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20010120211001 is a prime.

It is a super-2 number, since 2×20010120211001² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20010120211007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 983868296 + ... + 983888633.

It is an arithmetic number, because the mean of its divisors is an integer number (5003021994525).

Almost surely, 2^{20010120211001} is an apocalyptic number.

It is an amenable number.

20010120211001 is a deficient number, since it is larger than the sum of its proper divisors (1967767099).

20010120211001 is a wasteful number, since it uses less digits than its factorization.

20010120211001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1967767098.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20010120211001 its reverse (10011202101002), we get a palindrome (30021322312003).

The spelling of 20010120211001 in words is "twenty trillion, ten billion, one hundred twenty million, two hundred eleven thousand, one".