43121002321 has 2 divisors, whose sum is σ = 43121002322. Its totient is φ = 43121002320.

The previous prime is 43121002261. The next prime is 43121002391. The reversal of 43121002321 is 12320012134.

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., 40526118721 + 2594883600 = 201311^2 + 50940^2 .

It is a cyclic number.

It is not a de Polignac number, because 43121002321 - 2¹⁵ = 43120969553 is a prime.

It is not a weakly prime, because it can be changed into another prime (43121002391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21560501160 + 21560501161.

It is an arithmetic number, because the mean of its divisors is an integer number (21560501161).

Almost surely, 2^43121002321 is an apocalyptic number.

It is an amenable number.

43121002321 is a deficient number, since it is larger than the sum of its proper divisors (1).

43121002321 is an equidigital number, since it uses as much as digits as its factorization.

43121002321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 43121002321 its reverse (12320012134), we get a palindrome (55441014455).

The spelling of 43121002321 in words is "forty-three billion, one hundred twenty-one million, two thousand, three hundred twenty-one".