20001012210001 has 4 divisors (see below), whose sum is σ = 20001048372900. Its totient is φ = 20000976047104.

The previous prime is 20001012209963. The next prime is 20001012210031. The reversal of 20001012210001 is 10001221010002.

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 16380273035025 + 3620739174976 = 4047255^2 + 1902824^2 .

It is a cyclic number.

It is not a de Polignac number, because 20001012210001 - 2²⁵ = 20000978655569 is a prime.

It is a super-2 number, since 2×20001012210001² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20001012210001.

It is not an unprimeable number, because it can be changed into a prime (20001012210031) 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, 17238736 + ... + 18362353.

It is an arithmetic number, because the mean of its divisors is an integer number (5000262093225).

Almost surely, 2^{20001012210001} is an apocalyptic number.

It is an amenable number.

20001012210001 is a deficient number, since it is larger than the sum of its proper divisors (36162899).

20001012210001 is an equidigital number, since it uses as much as digits as its factorization.

20001012210001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36162898.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20001012210001 its reverse (10001221010002), we get a palindrome (30002233220003).

The spelling of 20001012210001 in words is "twenty trillion, one billion, twelve million, two hundred ten thousand, one".