43124252221 has 4 divisors (see below), whose sum is σ = 43124921500. Its totient is φ = 43123582944.

The previous prime is 43124252219. The next prime is 43124252309. The reversal of 43124252221 is 12225242134.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25126688196 + 17997564025 = 158514^2 + 134155^2 .

It is a cyclic number.

It is not a de Polignac number, because 43124252221 - 2¹ = 43124252219 is a prime.

It is a super-2 number, since 2×43124252221² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43124252221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43124256221) 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, 226296 + ... + 370753.

It is an arithmetic number, because the mean of its divisors is an integer number (10781230375).

Almost surely, 2^43124252221 is an apocalyptic number.

It is an amenable number.

43124252221 is a deficient number, since it is larger than the sum of its proper divisors (669279).

43124252221 is an equidigital number, since it uses as much as digits as its factorization.

43124252221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669278.

The product of its digits is 7680, while the sum is 28.

Adding to 43124252221 its reverse (12225242134), we get a palindrome (55349494355).

The spelling of 43124252221 in words is "forty-three billion, one hundred twenty-four million, two hundred fifty-two thousand, two hundred twenty-one".