121242257 has 4 divisors (see below), whose sum is σ = 121376256. Its totient is φ = 121108260.

The previous prime is 121242221. The next prime is 121242293. The reversal of 121242257 is 752242121.

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: 752242121 = 11351 ⋅66271.

It is an interprime number because it is at equal distance from previous prime (121242221) and next prime (121242293).

It is a cyclic number.

It is not a de Polignac number, because 121242257 - 2⁶ = 121242193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121272257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65633 + ... + 67454.

It is an arithmetic number, because the mean of its divisors is an integer number (30344064).

Almost surely, 2^121242257 is an apocalyptic number.

It is an amenable number.

121242257 is a deficient number, since it is larger than the sum of its proper divisors (133999).

121242257 is an equidigital number, since it uses as much as digits as its factorization.

121242257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133998.

The product of its digits is 2240, while the sum is 26.

The square root of 121242257 is about 11011.0061756408. The cubic root of 121242257 is about 494.9386136167.

Adding to 121242257 its reverse (752242121), we get a palindrome (873484378).

The spelling of 121242257 in words is "one hundred twenty-one million, two hundred forty-two thousand, two hundred fifty-seven".