42031013221 has 4 divisors (see below), whose sum is σ = 42031465344. Its totient is φ = 42030561100.

The previous prime is 42031013177. The next prime is 42031013237. The reversal of 42031013221 is 12231013024.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 42031013221 - 2²³ = 42022624613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42031013261) 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, 29845 + ... + 291466.

It is an arithmetic number, because the mean of its divisors is an integer number (10507866336).

Almost surely, 2^42031013221 is an apocalyptic number.

It is an amenable number.

42031013221 is a deficient number, since it is larger than the sum of its proper divisors (452123).

42031013221 is a wasteful number, since it uses less digits than its factorization.

42031013221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452122.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 42031013221 its reverse (12231013024), we get a palindrome (54262026245).

The spelling of 42031013221 in words is "forty-two billion, thirty-one million, thirteen thousand, two hundred twenty-one".