20001222012211 has 32 divisors (see below), whose sum is σ = 23058765227520. Its totient is φ = 17171375232000.

The previous prime is 20001222012169. The next prime is 20001222012223. The reversal of 20001222012211 is 11221022210002.

It is a happy number.

It is not a de Polignac number, because 20001222012211 - 2⁹ = 20001222011699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20001222012271) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7911520 + ... + 10128898.

It is an arithmetic number, because the mean of its divisors is an integer number (720586413360).

Almost surely, 2^{20001222012211} is an apocalyptic number.

20001222012211 is a deficient number, since it is larger than the sum of its proper divisors (3057543215309).

20001222012211 is a wasteful number, since it uses less digits than its factorization.

20001222012211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2217867.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20001222012211 its reverse (11221022210002), we get a palindrome (31222244222213).

The spelling of 20001222012211 in words is "twenty trillion, one billion, two hundred twenty-two million, twelve thousand, two hundred eleven".