139808540021 has 8 divisors (see below), whose sum is σ = 141979879104. Its totient is φ = 137653588800.

The previous prime is 139808539999. The next prime is 139808540023. The reversal of 139808540021 is 120045808931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 139808540021 - 2¹⁴ = 139808523637 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 (139808540023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4079771 + ... + 4113896.

It is an arithmetic number, because the mean of its divisors is an integer number (17747484888).

Almost surely, 2^139808540021 is an apocalyptic number.

It is an amenable number.

139808540021 is a deficient number, since it is larger than the sum of its proper divisors (2171339083).

139808540021 is a wasteful number, since it uses less digits than its factorization.

139808540021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8193931.

The product of its (nonzero) digits is 69120, while the sum is 41.

The spelling of 139808540021 in words is "one hundred thirty-nine billion, eight hundred eight million, five hundred forty thousand, twenty-one".