331401042431021 has 4 divisors (see below), whose sum is σ = 331539761999100. Its totient is φ = 331262322862944.

The previous prime is 331401042430967. The next prime is 331401042431071. The reversal of 331401042431021 is 120134240104133.

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 32874868462921 + 298526173968100 = 5733661^2 + 17277910^2 .

It is a cyclic number.

It is not a de Polignac number, because 331401042431021 - 2¹⁸ = 331401042168877 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 (331401042431071) 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, 69359780456 + ... + 69359785233.

It is an arithmetic number, because the mean of its divisors is an integer number (82884940499775).

Almost surely, 2^{331401042431021} is an apocalyptic number.

It is an amenable number.

331401042431021 is a deficient number, since it is larger than the sum of its proper divisors (138719568079).

331401042431021 is a wasteful number, since it uses less digits than its factorization.

331401042431021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138719568078.

The product of its (nonzero) digits is 6912, while the sum is 29.

Adding to 331401042431021 its reverse (120134240104133), we get a palindrome (451535282535154).

The spelling of 331401042431021 in words is "three hundred thirty-one trillion, four hundred one billion, forty-two million, four hundred thirty-one thousand, twenty-one".