20011222221211 has 32 divisors (see below), whose sum is σ = 23503521888000. Its totient is φ = 16869973534848.

The previous prime is 20011222221187. The next prime is 20011222221241. The reversal of 20011222221211 is 11212222211002.

It is a cyclic number.

It is not a de Polignac number, because 20011222221211 - 2⁷ = 20011222221083 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (20011222221241) 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, 2433420 + ... + 6778198.

It is an arithmetic number, because the mean of its divisors is an integer number (734485059000).

Almost surely, 2^{20011222221211} is an apocalyptic number.

20011222221211 is a deficient number, since it is larger than the sum of its proper divisors (3492299666789).

20011222221211 is a wasteful number, since it uses less digits than its factorization.

20011222221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4345483.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 20011222221211 its reverse (11212222211002), we get a palindrome (31223444432213).

The spelling of 20011222221211 in words is "twenty trillion, eleven billion, two hundred twenty-two million, two hundred twenty-one thousand, two hundred eleven".