438030872021 has 2 divisors, whose sum is σ = 438030872022. Its totient is φ = 438030872020.

The previous prime is 438030872017. The next prime is 438030872033. The reversal of 438030872021 is 120278030834.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 385006599121 + 53024272900 = 620489^2 + 230270^2 .

It is a cyclic number.

It is not a de Polignac number, because 438030872021 - 2² = 438030872017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (438030872921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219015436010 + 219015436011.

It is an arithmetic number, because the mean of its divisors is an integer number (219015436011).

Almost surely, 2^438030872021 is an apocalyptic number.

It is an amenable number.

438030872021 is a deficient number, since it is larger than the sum of its proper divisors (1).

438030872021 is an equidigital number, since it uses as much as digits as its factorization.

438030872021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 38.

The spelling of 438030872021 in words is "four hundred thirty-eight billion, thirty million, eight hundred seventy-two thousand, twenty-one".