121205257 has 16 divisors (see below), whose sum is σ = 133056000. Its totient is φ = 109912320.

The previous prime is 121205233. The next prime is 121205309. The reversal of 121205257 is 752502121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121205257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121205207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 183594 + ... + 184252.

It is an arithmetic number, because the mean of its divisors is an integer number (8316000).

Almost surely, 2^121205257 is an apocalyptic number.

121205257 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

121205257 is a deficient number, since it is larger than the sum of its proper divisors (11850743).

121205257 is a wasteful number, since it uses less digits than its factorization.

121205257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 121205257 is about 11009.3259103362. The cubic root of 121205257 is about 494.8882610078. Note that the first 3 decimals are identical.

Adding to 121205257 its reverse (752502121), we get a palindrome (873707378).

The spelling of 121205257 in words is "one hundred twenty-one million, two hundred five thousand, two hundred fifty-seven".