121043523 has 4 divisors (see below), whose sum is σ = 161391368. Its totient is φ = 80695680.

The previous prime is 121043501. The next prime is 121043557. The reversal of 121043523 is 325340121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 325340121 = 3 ⋅108446707.

It is not a de Polignac number, because 121043523 - 2⁵ = 121043491 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121043523.

It is not an unprimeable number, because it can be changed into a prime (121043123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20173918 + ... + 20173923.

It is an arithmetic number, because the mean of its divisors is an integer number (40347842).

Almost surely, 2^121043523 is an apocalyptic number.

121043523 is a deficient number, since it is larger than the sum of its proper divisors (40347845).

121043523 is an equidigital number, since it uses as much as digits as its factorization.

121043523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40347844.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 121043523 is about 11001.9781403164. The cubic root of 121043523 is about 494.6680398507.

Adding to 121043523 its reverse (325340121), we get a palindrome (446383644).

The spelling of 121043523 in words is "one hundred twenty-one million, forty-three thousand, five hundred twenty-three".