43201621 has 2 divisors, whose sum is σ = 43201622. Its totient is φ = 43201620.

The previous prime is 43201591. The next prime is 43201633. The reversal of 43201621 is 12610234.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41280625 + 1920996 = 6425^2 + 1386^2 .

It is a cyclic number.

It is not a de Polignac number, because 43201621 - 2⁷ = 43201493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43201021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21600810 + 21600811.

It is an arithmetic number, because the mean of its divisors is an integer number (21600811).

Almost surely, 2^43201621 is an apocalyptic number.

It is an amenable number.

43201621 is a deficient number, since it is larger than the sum of its proper divisors (1).

43201621 is an equidigital number, since it uses as much as digits as its factorization.

43201621 is an evil number, because the sum of its binary digits is even.

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

The square root of 43201621 is about 6572.7940025533. The cubic root of 43201621 is about 350.8865172647.

Adding to 43201621 its reverse (12610234), we get a palindrome (55811855).

The spelling of 43201621 in words is "forty-three million, two hundred one thousand, six hundred twenty-one".