121302257 has 4 divisors (see below), whose sum is σ = 121346160. Its totient is φ = 121258356.

The previous prime is 121302239. The next prime is 121302263. The reversal of 121302257 is 752203121.

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: 752203121 = 3929 ⋅191449.

It is a cyclic number.

It is not a de Polignac number, because 121302257 - 2¹² = 121298161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121302277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17507 + ... + 23432.

It is an arithmetic number, because the mean of its divisors is an integer number (30336540).

Almost surely, 2^121302257 is an apocalyptic number.

It is an amenable number.

121302257 is a deficient number, since it is larger than the sum of its proper divisors (43903).

121302257 is an equidigital number, since it uses as much as digits as its factorization.

121302257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43902.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 121302257 is about 11013.7303852963. The cubic root of 121302257 is about 495.0202447252.

Adding to 121302257 its reverse (752203121), we get a palindrome (873505378).

The spelling of 121302257 in words is "one hundred twenty-one million, three hundred two thousand, two hundred fifty-seven".