122221212021 has 24 divisors (see below), whose sum is σ = 176972394456. Its totient is φ = 81282263040.

The previous prime is 122221212013. The next prime is 122221212023. The reversal of 122221212021 is 120212122221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 66920516100 + 55300695921 = 258690^2 + 235161^2 .

It is not a de Polignac number, because 122221212021 - 2³ = 122221212013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 122221211985 and 122221212003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122221212023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7746781 + ... + 7762541.

It is an arithmetic number, because the mean of its divisors is an integer number (7373849769).

Almost surely, 2^122221212021 is an apocalyptic number.

It is an amenable number.

122221212021 is a deficient number, since it is larger than the sum of its proper divisors (54751182435).

122221212021 is a wasteful number, since it uses less digits than its factorization.

122221212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17813 (or 17810 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 122221212021 its reverse (120212122221), we get a palindrome (242433334242).

The spelling of 122221212021 in words is "one hundred twenty-two billion, two hundred twenty-one million, two hundred twelve thousand, twenty-one".