40400340121 has 4 divisors (see below), whose sum is σ = 42156876672. Its totient is φ = 38643803572.

The previous prime is 40400340103. The next prime is 40400340139. The reversal of 40400340121 is 12104300404.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (40400340103) and next prime (40400340139).

It is a cyclic number.

It is not a de Polignac number, because 40400340121 - 2⁵ = 40400340089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40400340161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 878268241 + ... + 878268286.

It is an arithmetic number, because the mean of its divisors is an integer number (10539219168).

Almost surely, 2^40400340121 is an apocalyptic number.

It is an amenable number.

40400340121 is a deficient number, since it is larger than the sum of its proper divisors (1756536551).

40400340121 is a wasteful number, since it uses less digits than its factorization.

40400340121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1756536550.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 40400340121 its reverse (12104300404), we get a palindrome (52504640525).

The spelling of 40400340121 in words is "forty billion, four hundred million, three hundred forty thousand, one hundred twenty-one".