121221022212 has 18 divisors (see below), whose sum is σ = 306419806238. Its totient is φ = 40407007392.

The previous prime is 121221022199. The next prime is 121221022261. The reversal of 121221022212 is 212220122121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 119650960836 + 1570061376 = 345906^2 + 39624^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×121221022212² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1683625273 + ... + 1683625344.

Almost surely, 2^121221022212 is an apocalyptic number.

121221022212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121221022212 is an abundant number, since it is smaller than the sum of its proper divisors (185198784026).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121221022212 is a wasteful number, since it uses less digits than its factorization.

121221022212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3367250627 (or 3367250622 counting only the distinct ones).

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

Adding to 121221022212 its reverse (212220122121), we get a palindrome (333441144333).

Subtracting 121221022212 from its reverse (212220122121), we obtain a palindrome (90999099909).

The spelling of 121221022212 in words is "one hundred twenty-one billion, two hundred twenty-one million, twenty-two thousand, two hundred twelve".