43222450021 has 4 divisors (see below), whose sum is σ = 43223634412. Its totient is φ = 43221265632.

The previous prime is 43222450013. The next prime is 43222450039. The reversal of 43222450021 is 12005422234.

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 2535122500 + 40687327521 = 50350^2 + 201711^2 .

It is a cyclic number.

It is not a de Polignac number, because 43222450021 - 2³ = 43222450013 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 (43222450081) 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, 535656 + ... + 611041.

It is an arithmetic number, because the mean of its divisors is an integer number (10805908603).

Almost surely, 2^43222450021 is an apocalyptic number.

It is an amenable number.

43222450021 is a deficient number, since it is larger than the sum of its proper divisors (1184391).

43222450021 is a wasteful number, since it uses less digits than its factorization.

43222450021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1184390.

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 43222450021 its reverse (12005422234), we get a palindrome (55227872255).

The spelling of 43222450021 in words is "forty-three billion, two hundred twenty-two million, four hundred fifty thousand, twenty-one".