121202221 has 4 divisors (see below), whose sum is σ = 138516832. Its totient is φ = 103887612.

The previous prime is 121202209. The next prime is 121202239. The reversal of 121202221 is 122202121.

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, and also an emirpimes, since its reverse is a distinct semiprime: 122202121 = 3371 ⋅36251.

It is a cyclic number.

It is not a de Polignac number, because 121202221 - 2⁵ = 121202189 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 (121202201) 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, 8657295 + ... + 8657308.

It is an arithmetic number, because the mean of its divisors is an integer number (34629208).

Almost surely, 2^121202221 is an apocalyptic number.

It is an amenable number.

121202221 is a deficient number, since it is larger than the sum of its proper divisors (17314611).

121202221 is an equidigital number, since it uses as much as digits as its factorization.

121202221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17314610.

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

The square root of 121202221 is about 11009.1880263714. The cubic root of 121202221 is about 494.8841289172.

Adding to 121202221 its reverse (122202121), we get a palindrome (243404342).

It can be divided in two parts, 12120 and 2221, that added together give a palindrome (14341).

The spelling of 121202221 in words is "one hundred twenty-one million, two hundred two thousand, two hundred twenty-one".