121042251 has 24 divisors (see below), whose sum is σ = 191271600. Its totient is φ = 73152000.

The previous prime is 121042247. The next prime is 121042277. The reversal of 121042251 is 152240121.

It is not a de Polignac number, because 121042251 - 2² = 121042247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121042231) 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 23 ways as a sum of consecutive naturals, for example, 38175 + ... + 41223.

It is an arithmetic number, because the mean of its divisors is an integer number (7969650).

Almost surely, 2^121042251 is an apocalyptic number.

121042251 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121042251 is a deficient number, since it is larger than the sum of its proper divisors (70229349).

121042251 is a wasteful number, since it uses less digits than its factorization.

121042251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3467 (or 3464 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 121042251 is about 11001.9203323783. The cubic root of 121042251 is about 494.6663070856. Note that the first 3 decimals are identical.

Adding to 121042251 its reverse (152240121), we get a palindrome (273282372).

The spelling of 121042251 in words is "one hundred twenty-one million, forty-two thousand, two hundred fifty-one".