20112121222111 has 4 divisors (see below), whose sum is σ = 20290104595872. Its totient is φ = 19934137848352.

The previous prime is 20112121222091. The next prime is 20112121222129. The reversal of 20112121222111 is 11122212121102.

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 20112121222111 - 2¹⁵ = 20112121189343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112121223111) 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, 88991686711 + ... + 88991686936.

It is an arithmetic number, because the mean of its divisors is an integer number (5072526148968).

Almost surely, 2^{20112121222111} is an apocalyptic number.

20112121222111 is a deficient number, since it is larger than the sum of its proper divisors (177983373761).

20112121222111 is a wasteful number, since it uses less digits than its factorization.

20112121222111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177983373760.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 20112121222111 its reverse (11122212121102), we get a palindrome (31234333343213).

It can be divided in two parts, 2011212 and 1222111, that added together give a palindrome (3233323).

The spelling of 20112121222111 in words is "twenty trillion, one hundred twelve billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred eleven".