43700720821 has 8 divisors (see below), whose sum is σ = 43985015424. Its totient is φ = 43416695760.

The previous prime is 43700720809. The next prime is 43700720873. The reversal of 43700720821 is 12802700734.

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

It is a cyclic number.

It is not a de Polignac number, because 43700720821 - 2²¹ = 43698623669 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 (43700720321) 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, 263176 + ... + 395806.

It is an arithmetic number, because the mean of its divisors is an integer number (5498126928).

Almost surely, 2^43700720821 is an apocalyptic number.

It is an amenable number.

43700720821 is a deficient number, since it is larger than the sum of its proper divisors (284294603).

43700720821 is a wasteful number, since it uses less digits than its factorization.

43700720821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134771.

The product of its (nonzero) digits is 18816, while the sum is 34.

The spelling of 43700720821 in words is "forty-three billion, seven hundred million, seven hundred twenty thousand, eight hundred twenty-one".