4321731112021 has 2 divisors, whose sum is σ = 4321731112022. Its totient is φ = 4321731112020.

The previous prime is 4321731112001. The next prime is 4321731112103. The reversal of 4321731112021 is 1202111371234.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3544600709521 + 777130402500 = 1882711^2 + 881550^2 .

It is a cyclic number.

It is not a de Polignac number, because 4321731112021 - 2¹³ = 4321731103829 is a prime.

It is a super-2 number, since 2×4321731112021² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4321731112001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2160865556010 + 2160865556011.

It is an arithmetic number, because the mean of its divisors is an integer number (2160865556011).

Almost surely, 2^{4321731112021} is an apocalyptic number.

It is an amenable number.

4321731112021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4321731112021 is an equidigital number, since it uses as much as digits as its factorization.

4321731112021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 28.

Adding to 4321731112021 its reverse (1202111371234), we get a palindrome (5523842483255).

The spelling of 4321731112021 in words is "four trillion, three hundred twenty-one billion, seven hundred thirty-one million, one hundred twelve thousand, twenty-one".