121001221 has 4 divisors (see below), whose sum is σ = 132001344. Its totient is φ = 110001100.

The previous prime is 121001213. The next prime is 121001239. The reversal of 121001221 is 122100121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 121001221 - 2³ = 121001213 is a prime.

It is a Duffinian number.

121001221 is a modest number, since divided by 1221 gives 121 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 121001198 and 121001207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121001281) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5500045 + ... + 5500066.

It is an arithmetic number, because the mean of its divisors is an integer number (33000336).

Almost surely, 2^121001221 is an apocalyptic number.

121001221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121001221 is a deficient number, since it is larger than the sum of its proper divisors (11000123).

121001221 is a wasteful number, since it uses less digits than its factorization.

121001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11000122.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 121001221 is about 11000.0554998600. The cubic root of 121001221 is about 494.6104080032.

Adding to 121001221 its reverse (122100121), we get a palindrome (243101342).

The spelling of 121001221 in words is "one hundred twenty-one million, one thousand, two hundred twenty-one".