121312251 has 12 divisors (see below), whose sum is σ = 177198840. Its totient is φ = 79965600.

The previous prime is 121312229. The next prime is 121312253. The reversal of 121312251 is 152213121.

It is not a de Polignac number, because 121312251 - 2¹⁰ = 121311227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121312253) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74925 + ... + 76526.

It is an arithmetic number, because the mean of its divisors is an integer number (14766570).

Almost surely, 2^121312251 is an apocalyptic number.

121312251 is a deficient number, since it is larger than the sum of its proper divisors (55886589).

121312251 is a wasteful number, since it uses less digits than its factorization.

121312251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151546 (or 151543 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 121312251 is about 11014.1840823549. The cubic root of 121312251 is about 495.0338391314.

Adding to 121312251 its reverse (152213121), we get a palindrome (273525372).

The spelling of 121312251 in words is "one hundred twenty-one million, three hundred twelve thousand, two hundred fifty-one".