42544132721 has 2 divisors, whose sum is σ = 42544132722. Its totient is φ = 42544132720.

The previous prime is 42544132699. The next prime is 42544132733. The reversal of 42544132721 is 12723144524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41192761600 + 1351371121 = 202960^2 + 36761^2 .

It is a cyclic number.

It is not a de Polignac number, because 42544132721 - 2¹⁰ = 42544131697 is a prime.

It is not a weakly prime, because it can be changed into another prime (42544132781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21272066360 + 21272066361.

It is an arithmetic number, because the mean of its divisors is an integer number (21272066361).

Almost surely, 2^42544132721 is an apocalyptic number.

It is an amenable number.

42544132721 is a deficient number, since it is larger than the sum of its proper divisors (1).

42544132721 is an equidigital number, since it uses as much as digits as its factorization.

42544132721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53760, while the sum is 35.

The spelling of 42544132721 in words is "forty-two billion, five hundred forty-four million, one hundred thirty-two thousand, seven hundred twenty-one".