20012121222211 has 4 divisors (see below), whose sum is σ = 20013149138400. Its totient is φ = 20011093306024.

The previous prime is 20012121222199. The next prime is 20012121222239. The reversal of 20012121222211 is 11222212121002.

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 20012121222211 - 2¹⁷ = 20012121091139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20012121222241) 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, 513928891 + ... + 513967828.

It is an arithmetic number, because the mean of its divisors is an integer number (5003287284600).

Almost surely, 2^{20012121222211} is an apocalyptic number.

20012121222211 is a deficient number, since it is larger than the sum of its proper divisors (1027916189).

20012121222211 is a wasteful number, since it uses less digits than its factorization.

20012121222211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1027916188.

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

Adding to 20012121222211 its reverse (11222212121002), we get a palindrome (31234333343213).

The spelling of 20012121222211 in words is "twenty trillion, twelve billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred eleven".