4031323121021 has 6 divisors (see below), whose sum is σ = 4689498324510. Its totient is φ = 3455419817976.

The previous prime is 4031323121003. The next prime is 4031323121029. The reversal of 4031323121021 is 1201213231304.

It can be written as a sum of positive squares in only one way, i.e., 3327016128121 + 704306992900 = 1824011^2 + 839230^2 .

It is not a de Polignac number, because 4031323121021 - 2³⁴ = 4014143251837 is a prime.

It is a super-2 number, since 2×4031323121021² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4031323121029) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 41135950166 + ... + 41135950263.

It is an arithmetic number, because the mean of its divisors is an integer number (781583054085).

Almost surely, 2^{4031323121021} is an apocalyptic number.

It is an amenable number.

4031323121021 is a deficient number, since it is larger than the sum of its proper divisors (658175203489).

4031323121021 is an equidigital number, since it uses as much as digits as its factorization.

4031323121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82271900443 (or 82271900436 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 4031323121021 its reverse (1201213231304), we get a palindrome (5232536352325).

The spelling of 4031323121021 in words is "four trillion, thirty-one billion, three hundred twenty-three million, one hundred twenty-one thousand, twenty-one".