121601043 has 12 divisors (see below), whose sum is σ = 177458008. Its totient is φ = 80231040.

The previous prime is 121601041. The next prime is 121601057. The reversal of 121601043 is 340106121.

It is a happy number.

121601043 is a `hidden beast` number, since 1 + 21 + 601 + 0 + 43 = 666.

It is not a de Polignac number, because 121601043 - 2¹ = 121601041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121601041) 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 11 ways as a sum of consecutive naturals, for example, 68773 + ... + 70518.

Almost surely, 2^121601043 is an apocalyptic number.

121601043 is a deficient number, since it is larger than the sum of its proper divisors (55856965).

121601043 is a wasteful number, since it uses less digits than its factorization.

121601043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139394 (or 139391 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 121601043 is about 11027.2862935538. The cubic root of 121601043 is about 495.4263483179.

Adding to 121601043 its reverse (340106121), we get a palindrome (461707164).

It can be divided in two parts, 12160 and 1043, that added together give a triangular number (13203 = T₁₆₂).

The spelling of 121601043 in words is "one hundred twenty-one million, six hundred one thousand, forty-three".