40406733421 has 2 divisors, whose sum is σ = 40406733422. Its totient is φ = 40406733420.

The previous prime is 40406733377. The next prime is 40406733443. The reversal of 40406733421 is 12433760404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39755973321 + 650760100 = 199389^2 + 25510^2 .

It is a cyclic number.

It is not a de Polignac number, because 40406733421 - 2²¹ = 40404636269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40406733721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20203366710 + 20203366711.

It is an arithmetic number, because the mean of its divisors is an integer number (20203366711).

Almost surely, 2^40406733421 is an apocalyptic number.

It is an amenable number.

40406733421 is a deficient number, since it is larger than the sum of its proper divisors (1).

40406733421 is an equidigital number, since it uses as much as digits as its factorization.

40406733421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 34.

The spelling of 40406733421 in words is "forty billion, four hundred six million, seven hundred thirty-three thousand, four hundred twenty-one".