121011221 has 4 divisors (see below), whose sum is σ = 121260192. Its totient is φ = 120762252.

The previous prime is 121011199. The next prime is 121011223. The reversal of 121011221 is 122110121.

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 a cyclic number.

It is not a de Polignac number, because 121011221 - 2¹⁴ = 120994837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121011223) 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, 123755 + ... + 124728.

It is an arithmetic number, because the mean of its divisors is an integer number (30315048).

Almost surely, 2^121011221 is an apocalyptic number.

It is an amenable number.

121011221 is a deficient number, since it is larger than the sum of its proper divisors (248971).

121011221 is an equidigital number, since it uses as much as digits as its factorization.

121011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248970.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 121011221 is about 11000.5100336303. The cubic root of 121011221 is about 494.6240331215.

Adding to 121011221 its reverse (122110121), we get a palindrome (243121342).

The spelling of 121011221 in words is "one hundred twenty-one million, eleven thousand, two hundred twenty-one".