121842457 has 16 divisors (see below), whose sum is σ = 134851392. Its totient is φ = 109169920.

The previous prime is 121842433. The next prime is 121842463. The reversal of 121842457 is 754248121.

It is a cyclic number.

It is not a de Polignac number, because 121842457 - 2¹¹ = 121840409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121842557) 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, 350958 + ... + 351304.

It is an arithmetic number, because the mean of its divisors is an integer number (8428212).

Almost surely, 2^121842457 is an apocalyptic number.

It is an amenable number.

121842457 is a deficient number, since it is larger than the sum of its proper divisors (13008935).

121842457 is a wasteful number, since it uses less digits than its factorization.

121842457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728.

The product of its digits is 17920, while the sum is 34.

The square root of 121842457 is about 11038.2270768453. The cubic root of 121842457 is about 495.7539874885.

It can be divided in two parts, 12184 and 2457, that added together give a palindrome (14641).

The spelling of 121842457 in words is "one hundred twenty-one million, eight hundred forty-two thousand, four hundred fifty-seven".