122121212021 has 4 divisors (see below), whose sum is σ = 122203229100. Its totient is φ = 122039194944.

The previous prime is 122121211981. The next prime is 122121212029. The reversal of 122121212021 is 120212121221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120212121221 = 269 ⋅446885209.

It can be written as a sum of positive squares in 2 ways, for example, as 59007211396 + 63114000625 = 242914^2 + 251225^2 .

It is a cyclic number.

It is not a de Polignac number, because 122121212021 - 2¹⁰ = 122121210997 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 (122121212029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41006306 + ... + 41009283.

It is an arithmetic number, because the mean of its divisors is an integer number (30550807275).

Almost surely, 2^122121212021 is an apocalyptic number.

It is an amenable number.

122121212021 is a deficient number, since it is larger than the sum of its proper divisors (82017079).

122121212021 is an equidigital number, since it uses as much as digits as its factorization.

122121212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82017078.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 122121212021 its reverse (120212121221), we get a palindrome (242333333242).

The spelling of 122121212021 in words is "one hundred twenty-two billion, one hundred twenty-one million, two hundred twelve thousand, twenty-one".