43146301621 has 2 divisors, whose sum is σ = 43146301622. Its totient is φ = 43146301620.

The previous prime is 43146301591. The next prime is 43146301697. The reversal of 43146301621 is 12610364134.

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., 27878980900 + 15267320721 = 166970^2 + 123561^2 .

It is a cyclic number.

It is not a de Polignac number, because 43146301621 - 2¹⁷ = 43146170549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43146301421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21573150810 + 21573150811.

It is an arithmetic number, because the mean of its divisors is an integer number (21573150811).

Almost surely, 2^43146301621 is an apocalyptic number.

It is an amenable number.

43146301621 is a deficient number, since it is larger than the sum of its proper divisors (1).

43146301621 is an equidigital number, since it uses as much as digits as its factorization.

43146301621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 31.

Adding to 43146301621 its reverse (12610364134), we get a palindrome (55756665755).

The spelling of 43146301621 in words is "forty-three billion, one hundred forty-six million, three hundred one thousand, six hundred twenty-one".