43220761021 has 4 divisors (see below), whose sum is σ = 44036247132. Its totient is φ = 42405274912.

The previous prime is 43220760991. The next prime is 43220761033. The reversal of 43220761021 is 12016702234.

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 23805404100 + 19415356921 = 154290^2 + 139339^2 .

It is a cyclic number.

It is not a de Polignac number, because 43220761021 - 2⁷ = 43220760893 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 (43220761091) 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, 407742976 + ... + 407743081.

It is an arithmetic number, because the mean of its divisors is an integer number (11009061783).

Almost surely, 2^43220761021 is an apocalyptic number.

It is an amenable number.

43220761021 is a deficient number, since it is larger than the sum of its proper divisors (815486111).

43220761021 is an equidigital number, since it uses as much as digits as its factorization.

43220761021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815486110.

The product of its (nonzero) digits is 4032, while the sum is 28.

The spelling of 43220761021 in words is "forty-three billion, two hundred twenty million, seven hundred sixty-one thousand, twenty-one".