20112120122221 has 16 divisors (see below), whose sum is σ = 20176375069440. Its totient is φ = 20047977813760.

The previous prime is 20112120122219. The next prime is 20112120122261. The reversal of 20112120122221 is 12222102121102.

It is a cyclic number.

It is not a de Polignac number, because 20112120122221 - 2¹ = 20112120122219 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 (20112120122261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2331295110 + ... + 2331303736.

It is an arithmetic number, because the mean of its divisors is an integer number (1261023441840).

Almost surely, 2^{20112120122221} is an apocalyptic number.

It is an amenable number.

20112120122221 is a deficient number, since it is larger than the sum of its proper divisors (64254947219).

20112120122221 is a wasteful number, since it uses less digits than its factorization.

20112120122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14324.

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

Adding to 20112120122221 its reverse (12222102121102), we get a palindrome (32334222243323).

It can be divided in two parts, 20112120 and 122221, that added together give a triangular number (20234341 = T₆₃₆₁).

The spelling of 20112120122221 in words is "twenty trillion, one hundred twelve billion, one hundred twenty million, one hundred twenty-two thousand, two hundred twenty-one".