122220122221 has 4 divisors (see below), whose sum is σ = 124223730844. Its totient is φ = 120216513600.

The previous prime is 122220122203. The next prime is 122220122261. The reversal of 122220122221 is 122221022221.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18255792996 + 103964329225 = 135114^2 + 322435^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122220122221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122220122261) 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, 1001804220 + ... + 1001804341.

It is an arithmetic number, because the mean of its divisors is an integer number (31055932711).

Almost surely, 2^122220122221 is an apocalyptic number.

It is an amenable number.

122220122221 is a deficient number, since it is larger than the sum of its proper divisors (2003608623).

122220122221 is an equidigital number, since it uses as much as digits as its factorization.

122220122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2003608622.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 122220122221 its reverse (122221022221), we get a palindrome (244441144442).

The spelling of 122220122221 in words is "one hundred twenty-two billion, two hundred twenty million, one hundred twenty-two thousand, two hundred twenty-one".