20012212211111 has 4 divisors (see below), whose sum is σ = 20012221334112. Its totient is φ = 20012203088112.

The previous prime is 20012212211099. The next prime is 20012212211113. The reversal of 20012212211111 is 11111221221002.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20012212211111 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20012212211111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012212211113) 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, 943250 + ... + 6396416.

It is an arithmetic number, because the mean of its divisors is an integer number (5003055333528).

Almost surely, 2^{20012212211111} is an apocalyptic number.

20012212211111 is a deficient number, since it is larger than the sum of its proper divisors (9123001).

20012212211111 is an equidigital number, since it uses as much as digits as its factorization.

20012212211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9123000.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 20012212211111 its reverse (11111221221002), we get a palindrome (31123433432113).

The spelling of 20012212211111 in words is "twenty trillion, twelve billion, two hundred twelve million, two hundred eleven thousand, one hundred eleven".