122212212122221 has 16 divisors (see below), whose sum is σ = 131906703201840. Its totient is φ = 112559930081280.

The previous prime is 122212212122191. The next prime is 122212212122261. The reversal of 122212212122221 is 122221212212221.

It can be written as a sum of positive squares in 8 ways, for example, as 44233952041321 + 77978260080900 = 6650861^2 + 8830530^2 .

It is a cyclic number.

It is not a de Polignac number, because 122212212122221 - 2³³ = 122203622187629 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 (122212212122261) 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, 5054061 + ... + 16430701.

It is an arithmetic number, because the mean of its divisors is an integer number (8244168950115).

Almost surely, 2^{122212212122221} is an apocalyptic number.

It is an amenable number.

122212212122221 is a deficient number, since it is larger than the sum of its proper divisors (9694491079619).

122212212122221 is a wasteful number, since it uses less digits than its factorization.

122212212122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11378496.

The product of its digits is 1024, while the sum is 25.

Adding to 122212212122221 its reverse (122221212212221), we get a palindrome (244433424334442).

The spelling of 122212212122221 in words is "one hundred twenty-two trillion, two hundred twelve billion, two hundred twelve million, one hundred twenty-two thousand, two hundred twenty-one".