121531042 has 4 divisors (see below), whose sum is σ = 182296566. Its totient is φ = 60765520.

The previous prime is 121531037. The next prime is 121531117. The reversal of 121531042 is 240135121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 240135121 = 3331 ⋅72091.

It can be written as a sum of positive squares in only one way, i.e., 113230881 + 8300161 = 10641^2 + 2881^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30382759 + ... + 30382762.

Almost surely, 2^121531042 is an apocalyptic number.

121531042 is a deficient number, since it is larger than the sum of its proper divisors (60765524).

121531042 is an equidigital number, since it uses as much as digits as its factorization.

121531042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60765523.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 121531042 is about 11024.1118463122. Note that the first 3 decimals coincide. The cubic root of 121531042 is about 495.3312641646.

Adding to 121531042 its reverse (240135121), we get a palindrome (361666163).

The spelling of 121531042 in words is "one hundred twenty-one million, five hundred thirty-one thousand, forty-two".