121212220022 has 4 divisors (see below), whose sum is σ = 181818330036. Its totient is φ = 60606110010.

The previous prime is 121212220009. The next prime is 121212220067. The reversal of 121212220022 is 220022212121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 220022212121 = 12763 ⋅17239067.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30303055004 + ... + 30303055007.

It is an arithmetic number, because the mean of its divisors is an integer number (45454582509).

Almost surely, 2^121212220022 is an apocalyptic number.

121212220022 is a deficient number, since it is larger than the sum of its proper divisors (60606110014).

121212220022 is an equidigital number, since it uses as much as digits as its factorization.

121212220022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60606110013.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 121212220022 its reverse (220022212121), we get a palindrome (341234432143).

The spelling of 121212220022 in words is "one hundred twenty-one billion, two hundred twelve million, two hundred twenty thousand, twenty-two".