121012221 has 12 divisors (see below), whose sum is σ = 177351776. Its totient is φ = 73340520.

The previous prime is 121012219. The next prime is 121012249. The reversal of 121012221 is 122210121.

It is not a de Polignac number, because 121012221 - 2¹ = 121012219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121012197 and 121012206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121012201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 166321 + ... + 167046.

Almost surely, 2^121012221 is an apocalyptic number.

121012221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121012221 is a deficient number, since it is larger than the sum of its proper divisors (56339555).

121012221 is a wasteful number, since it uses less digits than its factorization.

121012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333392 (or 333381 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 121012221 is about 11000.5554859743. Note that the first 3 decimals coincide. The cubic root of 121012221 is about 494.6253955920.

Adding to 121012221 its reverse (122210121), we get a palindrome (243222342).

It can be divided in two parts, 1210 and 12221, that added together give a palindrome (13431).

The spelling of 121012221 in words is "one hundred twenty-one million, twelve thousand, two hundred twenty-one".