121222021 has 4 divisors (see below), whose sum is σ = 121571712. Its totient is φ = 120872332.

The previous prime is 121222007. The next prime is 121222037. The reversal of 121222021 is 120222121.

It is a happy number.

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 121222021 - 2²¹ = 119124869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121221992 and 121222010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121222051) 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, 174325 + ... + 175018.

It is an arithmetic number, because the mean of its divisors is an integer number (30392928).

Almost surely, 2^121222021 is an apocalyptic number.

It is an amenable number.

121222021 is a deficient number, since it is larger than the sum of its proper divisors (349691).

121222021 is an equidigital number, since it uses as much as digits as its factorization.

121222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349690.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 121222021 is about 11010.0872385281. The cubic root of 121222021 is about 494.9110760917.

Adding to 121222021 its reverse (120222121), we get a palindrome (241444142).

The spelling of 121222021 in words is "one hundred twenty-one million, two hundred twenty-two thousand, twenty-one".