20001011221211 has 16 divisors (see below), whose sum is σ = 20156583283200. Its totient is φ = 19845734062560.

The previous prime is 20001011221207. The next prime is 20001011221237. The reversal of 20001011221211 is 11212211010002.

It is not a de Polignac number, because 20001011221211 - 2² = 20001011221207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20001011221511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 652099406 + ... + 652130076.

It is an arithmetic number, because the mean of its divisors is an integer number (1259786455200).

Almost surely, 2^{20001011221211} is an apocalyptic number.

20001011221211 is a deficient number, since it is larger than the sum of its proper divisors (155572061989).

20001011221211 is a wasteful number, since it uses less digits than its factorization.

20001011221211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35314.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20001011221211 its reverse (11212211010002), we get a palindrome (31213222231213).

The spelling of 20001011221211 in words is "twenty trillion, one billion, eleven million, two hundred twenty-one thousand, two hundred eleven".