121710257 has 12 divisors (see below), whose sum is σ = 130147920. Its totient is φ = 113503896.

The previous prime is 121710241. The next prime is 121710269. The reversal of 121710257 is 752017121.

It is not a de Polignac number, because 121710257 - 2⁴ = 121710241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121710217) 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, 84578 + ... + 86004.

It is an arithmetic number, because the mean of its divisors is an integer number (10845660).

Almost surely, 2^121710257 is an apocalyptic number.

It is an amenable number.

121710257 is a deficient number, since it is larger than the sum of its proper divisors (8437663).

121710257 is an equidigital number, since it uses as much as digits as its factorization.

121710257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580 (or 1513 counting only the distinct ones).

The product of its (nonzero) digits is 980, while the sum is 26.

The square root of 121710257 is about 11032.2371711272. The cubic root of 121710257 is about 495.5746236434.

Adding to 121710257 its reverse (752017121), we get a palindrome (873727378).

The spelling of 121710257 in words is "one hundred twenty-one million, seven hundred ten thousand, two hundred fifty-seven".