43051122221 has 4 divisors (see below), whose sum is σ = 43693676352. Its totient is φ = 42408568092.

The previous prime is 43051122209. The next prime is 43051122239. The reversal of 43051122221 is 12222115034.

43051122221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43051122221 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 (43051121221) 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, 321276965 + ... + 321277098.

It is an arithmetic number, because the mean of its divisors is an integer number (10923419088).

Almost surely, 2^43051122221 is an apocalyptic number.

It is an amenable number.

43051122221 is a deficient number, since it is larger than the sum of its proper divisors (642554131).

43051122221 is an equidigital number, since it uses as much as digits as its factorization.

43051122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642554130.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 43051122221 its reverse (12222115034), we get a palindrome (55273237255).

The spelling of 43051122221 in words is "forty-three billion, fifty-one million, one hundred twenty-two thousand, two hundred twenty-one".