40442780221 has 4 divisors (see below), whose sum is σ = 40450257052. Its totient is φ = 40435303392.

The previous prime is 40442780197. The next prime is 40442780237. The reversal of 40442780221 is 12208724404.

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 7068605625 + 33374174596 = 84075^2 + 182686^2 .

It is a cyclic number.

It is not a de Polignac number, because 40442780221 - 2⁹ = 40442779709 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 (40442780321) 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, 3730296 + ... + 3741121.

It is an arithmetic number, because the mean of its divisors is an integer number (10112564263).

Almost surely, 2^40442780221 is an apocalyptic number.

It is an amenable number.

40442780221 is a deficient number, since it is larger than the sum of its proper divisors (7476831).

40442780221 is an equidigital number, since it uses as much as digits as its factorization.

40442780221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7476830.

The product of its (nonzero) digits is 28672, while the sum is 34.

The spelling of 40442780221 in words is "forty billion, four hundred forty-two million, seven hundred eighty thousand, two hundred twenty-one".