40121621564613 has 16 divisors (see below), whose sum is σ = 55221419606016. Its totient is φ = 25884793836720.

The previous prime is 40121621564611. The next prime is 40121621564639. The reversal of 40121621564613 is 31646512612104.

It is not a de Polignac number, because 40121621564613 - 2¹ = 40121621564611 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40121621564611) 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 in 15 ways as a sum of consecutive naturals, for example, 21164056 + ... + 22981742.

It is an arithmetic number, because the mean of its divisors is an integer number (3451338725376).

Almost surely, 2^{40121621564613} is an apocalyptic number.

It is an amenable number.

40121621564613 is a deficient number, since it is larger than the sum of its proper divisors (15099798041403).

40121621564613 is a wasteful number, since it uses less digits than its factorization.

40121621564613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2055064.

The product of its (nonzero) digits is 207360, while the sum is 42.

The spelling of 40121621564613 in words is "forty trillion, one hundred twenty-one billion, six hundred twenty-one million, five hundred sixty-four thousand, six hundred thirteen".