20001121220211 has 4 divisors (see below), whose sum is σ = 26668161626952. Its totient is φ = 13334080813472.

The previous prime is 20001121220207. The next prime is 20001121220287. The reversal of 20001121220211 is 11202212110002.

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

It is a cyclic number.

It is not a de Polignac number, because 20001121220211 - 2² = 20001121220207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20001121220291) 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, 3333520203366 + ... + 3333520203371.

It is an arithmetic number, because the mean of its divisors is an integer number (6667040406738).

Almost surely, 2^{20001121220211} is an apocalyptic number.

20001121220211 is a deficient number, since it is larger than the sum of its proper divisors (6667040406741).

20001121220211 is an equidigital number, since it uses as much as digits as its factorization.

20001121220211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6667040406740.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20001121220211 its reverse (11202212110002), we get a palindrome (31203333330213).

The spelling of 20001121220211 in words is "twenty trillion, one billion, one hundred twenty-one million, two hundred twenty thousand, two hundred eleven".