43122040021 has 8 divisors (see below), whose sum is σ = 43725740120. Its totient is φ = 42518691072.

The previous prime is 43122040009. The next prime is 43122040043. The reversal of 43122040021 is 12004022134.

It can be written as a sum of positive squares in 4 ways, for example, as 12976399396 + 30145640625 = 113914^2 + 173625^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43122040021 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 (43122040001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164575 + ... + 336643.

It is an arithmetic number, because the mean of its divisors is an integer number (5465717515).

Almost surely, 2^43122040021 is an apocalyptic number.

It is an amenable number.

43122040021 is a deficient number, since it is larger than the sum of its proper divisors (603700099).

43122040021 is a wasteful number, since it uses less digits than its factorization.

43122040021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175575.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 43122040021 its reverse (12004022134), we get a palindrome (55126062155).

The spelling of 43122040021 in words is "forty-three billion, one hundred twenty-two million, forty thousand, twenty-one".