121022221 has 2 divisors, whose sum is σ = 121022222. Its totient is φ = 121022220.

The previous prime is 121022197. The next prime is 121022261. The reversal of 121022221 is 122220121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70056900 + 50965321 = 8370^2 + 7139^2 .

It is a cyclic number.

It is not a de Polignac number, because 121022221 - 2⁵ = 121022189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121022261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60511110 + 60511111.

It is an arithmetic number, because the mean of its divisors is an integer number (60511111).

Almost surely, 2^121022221 is an apocalyptic number.

It is an amenable number.

121022221 is a deficient number, since it is larger than the sum of its proper divisors (1).

121022221 is an equidigital number, since it uses as much as digits as its factorization.

121022221 is an odious number, because the sum of its binary digits is odd.

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

The square root of 121022221 is about 11001.0099990864. The cubic root of 121022221 is about 494.6390198846.

Adding to 121022221 its reverse (122220121), we get a palindrome (243242342).

The spelling of 121022221 in words is "one hundred twenty-one million, twenty-two thousand, two hundred twenty-one".