121330251 has 16 divisors (see below), whose sum is σ = 205427200. Its totient is φ = 69331464.

The previous prime is 121330217. The next prime is 121330277. The reversal of 121330251 is 152033121.

It is not a de Polignac number, because 121330251 - 2⁷ = 121330123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121330201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 320791 + ... + 321168.

It is an arithmetic number, because the mean of its divisors is an integer number (12839200).

Almost surely, 2^121330251 is an apocalyptic number.

121330251 is a deficient number, since it is larger than the sum of its proper divisors (84096949).

121330251 is an equidigital number, since it uses as much as digits as its factorization.

121330251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641975 (or 641969 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 121330251 is about 11015.0011802087. The cubic root of 121330251 is about 495.0583218701.

Adding to 121330251 its reverse (152033121), we get a palindrome (273363372).

The spelling of 121330251 in words is "one hundred twenty-one million, three hundred thirty thousand, two hundred fifty-one".