43450243001221 has 4 divisors (see below), whose sum is σ = 49657420572832. Its totient is φ = 37243065429612.

The previous prime is 43450243001197. The next prime is 43450243001251. The reversal of 43450243001221 is 12210034205434.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 43450243001221 - 2¹⁵ = 43450242968453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43450243001251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3103588785795 + ... + 3103588785808.

It is an arithmetic number, because the mean of its divisors is an integer number (12414355143208).

Almost surely, 2^{43450243001221} is an apocalyptic number.

It is an amenable number.

43450243001221 is a deficient number, since it is larger than the sum of its proper divisors (6207177571611).

43450243001221 is an equidigital number, since it uses as much as digits as its factorization.

43450243001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6207177571610.

The product of its (nonzero) digits is 23040, while the sum is 31.

Adding to 43450243001221 its reverse (12210034205434), we get a palindrome (55660277206655).

The spelling of 43450243001221 in words is "forty-three trillion, four hundred fifty billion, two hundred forty-three million, one thousand, two hundred twenty-one".