20001020221211 has 4 divisors (see below), whose sum is σ = 20005683555000. Its totient is φ = 19996356887424.

The previous prime is 20001020221153. The next prime is 20001020221241. The reversal of 20001020221211 is 11212202010002.

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 20001020221211 - 2¹⁰ = 20001020220187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20001020221241) 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, 2331660461 + ... + 2331669038.

It is an arithmetic number, because the mean of its divisors is an integer number (5001420888750).

Almost surely, 2^{20001020221211} is an apocalyptic number.

20001020221211 is a deficient number, since it is larger than the sum of its proper divisors (4663333789).

20001020221211 is an equidigital number, since it uses as much as digits as its factorization.

20001020221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4663333788.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20001020221211 its reverse (11212202010002), we get a palindrome (31213222231213).

The spelling of 20001020221211 in words is "twenty trillion, one billion, twenty million, two hundred twenty-one thousand, two hundred eleven".