20001222201211 has 4 divisors (see below), whose sum is σ = 20002962811624. Its totient is φ = 19999481590800.

The previous prime is 20001222201209. The next prime is 20001222201287. The reversal of 20001222201211 is 11210222210002.

It is a happy number.

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 20001222201211 - 2¹ = 20001222201209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20001222201911) 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, 870287970 + ... + 870310951.

It is an arithmetic number, because the mean of its divisors is an integer number (5000740702906).

Almost surely, 2^{20001222201211} is an apocalyptic number.

20001222201211 is a deficient number, since it is larger than the sum of its proper divisors (1740610413).

20001222201211 is a wasteful number, since it uses less digits than its factorization.

20001222201211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1740610412.

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

Adding to 20001222201211 its reverse (11210222210002), we get a palindrome (31211444411213).

The spelling of 20001222201211 in words is "twenty trillion, one billion, two hundred twenty-two million, two hundred one thousand, two hundred eleven".