20001111211201 has 4 divisors (see below), whose sum is σ = 20488943192004. Its totient is φ = 19513279230400.

The previous prime is 20001111211199. The next prime is 20001111211399. The reversal of 20001111211201 is 10211211110002.

It is a happy number.

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 6430286711601 + 13570824499600 = 2535801^2 + 3683860^2 .

It is a cyclic number.

It is not a de Polignac number, because 20001111211201 - 2¹ = 20001111211199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20001111011201) 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, 243915990340 + ... + 243915990421.

It is an arithmetic number, because the mean of its divisors is an integer number (5122235798001).

Almost surely, 2^{20001111211201} is an apocalyptic number.

It is an amenable number.

20001111211201 is a deficient number, since it is larger than the sum of its proper divisors (487831980803).

20001111211201 is an equidigital number, since it uses as much as digits as its factorization.

20001111211201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487831980802.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 20001111211201 its reverse (10211211110002), we get a palindrome (30212322321203).

The spelling of 20001111211201 in words is "twenty trillion, one billion, one hundred eleven million, two hundred eleven thousand, two hundred one".