43231650421 has 2 divisors, whose sum is σ = 43231650422. Its totient is φ = 43231650420.

The previous prime is 43231650389. The next prime is 43231650433. The reversal of 43231650421 is 12405613234.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29766600900 + 13465049521 = 172530^2 + 116039^2 .

It is a cyclic number.

It is not a de Polignac number, because 43231650421 - 2⁵ = 43231650389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43231650461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21615825210 + 21615825211.

It is an arithmetic number, because the mean of its divisors is an integer number (21615825211).

Almost surely, 2^43231650421 is an apocalyptic number.

It is an amenable number.

43231650421 is a deficient number, since it is larger than the sum of its proper divisors (1).

43231650421 is an equidigital number, since it uses as much as digits as its factorization.

43231650421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 31.

The spelling of 43231650421 in words is "forty-three billion, two hundred thirty-one million, six hundred fifty thousand, four hundred twenty-one".