20001211211101 has 4 divisors (see below), whose sum is σ = 20120978943072. Its totient is φ = 19881443479132.

The previous prime is 20001211211053. The next prime is 20001211211123. The reversal of 20001211211101 is 10111211210002.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 20001211211101 - 2²³ = 20001202822493 is a prime.

It is a super-2 number, since 2×20001211211101² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001211211161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59883865735 + ... + 59883866068.

It is an arithmetic number, because the mean of its divisors is an integer number (5030244735768).

Almost surely, 2^{20001211211101} is an apocalyptic number.

It is an amenable number.

20001211211101 is a deficient number, since it is larger than the sum of its proper divisors (119767731971).

20001211211101 is a wasteful number, since it uses less digits than its factorization.

20001211211101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119767731970.

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

Adding to 20001211211101 its reverse (10111211210002), we get a palindrome (30112422421103).

The spelling of 20001211211101 in words is "twenty trillion, one billion, two hundred eleven million, two hundred eleven thousand, one hundred one".