121221028 has 12 divisors (see below), whose sum is σ = 217870492. Its totient is φ = 58972320.

The previous prime is 121221019. The next prime is 121221029. The reversal of 121221028 is 820122121.

It can be written as a sum of positive squares in 2 ways, for example, as 117679104 + 3541924 = 10848^2 + 1882^2 .

It is a junction number, because it is equal to n+sod(n) for n = 121220996 and 121221014.

It is not an unprimeable number, because it can be changed into a prime (121221029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 409383 + ... + 409678.

Almost surely, 2^121221028 is an apocalyptic number.

It is an amenable number.

121221028 is a deficient number, since it is larger than the sum of its proper divisors (96649464).

121221028 is a wasteful number, since it uses less digits than its factorization.

121221028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819102 (or 819100 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 121221028 is about 11010.0421434252. The cubic root of 121221028 is about 494.9097247200.

Adding to 121221028 its reverse (820122121), we get a palindrome (941343149).

The spelling of 121221028 in words is "one hundred twenty-one million, two hundred twenty-one thousand, twenty-eight".