43551502121 has 4 divisors (see below), whose sum is σ = 43663460100. Its totient is φ = 43439544144.

The previous prime is 43551502117. The next prime is 43551502129. The reversal of 43551502121 is 12120515534.

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 6978764521 + 36572737600 = 83539^2 + 191240^2 .

It is a cyclic number.

It is not a de Polignac number, because 43551502121 - 2² = 43551502117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43551502129) 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, 55978406 + ... + 55979183.

It is an arithmetic number, because the mean of its divisors is an integer number (10915865025).

Almost surely, 2^43551502121 is an apocalyptic number.

It is an amenable number.

43551502121 is a deficient number, since it is larger than the sum of its proper divisors (111957979).

43551502121 is a wasteful number, since it uses less digits than its factorization.

43551502121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111957978.

The product of its (nonzero) digits is 6000, while the sum is 29.

The spelling of 43551502121 in words is "forty-three billion, five hundred fifty-one million, five hundred two thousand, one hundred twenty-one".