121869221 has 2 divisors, whose sum is σ = 121869222. Its totient is φ = 121869220.

The previous prime is 121869217. The next prime is 121869227. The reversal of 121869221 is 122968121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116856100 + 5013121 = 10810^2 + 2239^2 .

It is a cyclic number.

It is not a de Polignac number, because 121869221 - 2² = 121869217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121869227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60934610 + 60934611.

It is an arithmetic number, because the mean of its divisors is an integer number (60934611).

Almost surely, 2^121869221 is an apocalyptic number.

It is an amenable number.

121869221 is a deficient number, since it is larger than the sum of its proper divisors (1).

121869221 is an equidigital number, since it uses as much as digits as its factorization.

121869221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 32.

The square root of 121869221 is about 11039.4393426478. The cubic root of 121869221 is about 495.7902840545.

The spelling of 121869221 in words is "one hundred twenty-one million, eight hundred sixty-nine thousand, two hundred twenty-one".