42531532121 has 4 divisors (see below), whose sum is σ = 45803188452. Its totient is φ = 39259875792.

The previous prime is 42531532103. The next prime is 42531532123. The reversal of 42531532121 is 12123513524.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28955786896 + 13575745225 = 170164^2 + 116515^2 .

It is a cyclic number.

It is not a de Polignac number, because 42531532121 - 2²⁶ = 42464423257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42531532123) 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, 1635828146 + ... + 1635828171.

It is an arithmetic number, because the mean of its divisors is an integer number (11450797113).

Almost surely, 2^42531532121 is an apocalyptic number.

It is an amenable number.

42531532121 is a deficient number, since it is larger than the sum of its proper divisors (3271656331).

42531532121 is a wasteful number, since it uses less digits than its factorization.

42531532121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3271656330.

The product of its digits is 7200, while the sum is 29.

The spelling of 42531532121 in words is "forty-two billion, five hundred thirty-one million, five hundred thirty-two thousand, one hundred twenty-one".