20122220112221 has 4 divisors (see below), whose sum is σ = 20257268569500. Its totient is φ = 19987171654944.

The previous prime is 20122220112209. The next prime is 20122220112233. The reversal of 20122220112221 is 12221102222102.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20122220112209) and next prime (20122220112233).

It can be written as a sum of positive squares in 2 ways, for example, as 8725613827225 + 11396606284996 = 2953915^2 + 3375886^2 .

It is a cyclic number.

It is not a de Polignac number, because 20122220112221 - 2³⁸ = 19847342205277 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20122220112193 and 20122220112202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20122220112271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67524228416 + ... + 67524228713.

It is an arithmetic number, because the mean of its divisors is an integer number (5064317142375).

Almost surely, 2^{20122220112221} is an apocalyptic number.

It is an amenable number.

20122220112221 is a deficient number, since it is larger than the sum of its proper divisors (135048457279).

20122220112221 is a wasteful number, since it uses less digits than its factorization.

20122220112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135048457278.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 20122220112221 its reverse (12221102222102), we get a palindrome (32343322334323).

The spelling of 20122220112221 in words is "twenty trillion, one hundred twenty-two billion, two hundred twenty million, one hundred twelve thousand, two hundred twenty-one".