431440254020021 has 2 divisors, whose sum is σ = 431440254020022. Its totient is φ = 431440254020020.

The previous prime is 431440254019963. The next prime is 431440254020053. The reversal of 431440254020021 is 120020452044134.

It is an a-pointer prime, because the next prime (431440254020053) can be obtained adding 431440254020021 to its sum of digits (32).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 360914505062500 + 70525748957521 = 18997750^2 + 8397961^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-431440254020021 is a prime.

It is a super-2 number, since 2×431440254020021² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 431440254020021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431440254020081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215720127010010 + 215720127010011.

It is an arithmetic number, because the mean of its divisors is an integer number (215720127010011).

Almost surely, 2^{431440254020021} is an apocalyptic number.

It is an amenable number.

431440254020021 is a deficient number, since it is larger than the sum of its proper divisors (1).

431440254020021 is an equidigital number, since it uses as much as digits as its factorization.

431440254020021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30720, while the sum is 32.

The spelling of 431440254020021 in words is "four hundred thirty-one trillion, four hundred forty billion, two hundred fifty-four million, twenty thousand, twenty-one".