121221122028 has 24 divisors (see below), whose sum is σ = 282912363888. Its totient is φ = 40398029376.

The previous prime is 121221122027. The next prime is 121221122069. The reversal of 121221122028 is 820221122121.

It is a junction number, because it is equal to n+sod(n) for n = 121221121989 and 121221122007.

It is not an unprimeable number, because it can be changed into a prime (121221122021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1070251 + ... + 1178082.

It is an arithmetic number, because the mean of its divisors is an integer number (11788015162).

Almost surely, 2^121221122028 is an apocalyptic number.

It is an amenable number.

121221122028 is an abundant number, since it is smaller than the sum of its proper divisors (161691241860).

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

121221122028 is a wasteful number, since it uses less digits than its factorization.

121221122028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2252833 (or 2252831 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

Adding to 121221122028 its reverse (820221122121), we get a palindrome (941442244149).

The spelling of 121221122028 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred twenty-two thousand, twenty-eight".