4431011020421 has 2 divisors, whose sum is σ = 4431011020422. Its totient is φ = 4431011020420.

The previous prime is 4431011020417. The next prime is 4431011020463. The reversal of 4431011020421 is 1240201101344.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3743083437025 + 687927583396 = 1934705^2 + 829414^2 .

It is a cyclic number.

It is not a de Polignac number, because 4431011020421 - 2² = 4431011020417 is a prime.

It is a super-3 number, since 3×4431011020421³ (a number of 39 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4431011020721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2215505510210 + 2215505510211.

It is an arithmetic number, because the mean of its divisors is an integer number (2215505510211).

Almost surely, 2^{4431011020421} is an apocalyptic number.

It is an amenable number.

4431011020421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4431011020421 is an equidigital number, since it uses as much as digits as its factorization.

4431011020421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 4431011020421 its reverse (1240201101344), we get a palindrome (5671212121765).

The spelling of 4431011020421 in words is "four trillion, four hundred thirty-one billion, eleven million, twenty thousand, four hundred twenty-one".