40445173421 has 2 divisors, whose sum is σ = 40445173422. Its totient is φ = 40445173420.

The previous prime is 40445173309. The next prime is 40445173451. The reversal of 40445173421 is 12437154404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20841253225 + 19603920196 = 144365^2 + 140014^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40445173421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40445173451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20222586710 + 20222586711.

It is an arithmetic number, because the mean of its divisors is an integer number (20222586711).

Almost surely, 2^40445173421 is an apocalyptic number.

It is an amenable number.

40445173421 is a deficient number, since it is larger than the sum of its proper divisors (1).

40445173421 is an equidigital number, since it uses as much as digits as its factorization.

40445173421 is an evil number, because the sum of its binary digits is even.

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

The spelling of 40445173421 in words is "forty billion, four hundred forty-five million, one hundred seventy-three thousand, four hundred twenty-one".