138766836921 has 8 divisors (see below), whose sum is σ = 195906122784. Its totient is φ = 87069387840.

The previous prime is 138766836917. The next prime is 138766836931. The reversal of 138766836921 is 129638667831.

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

It is not a de Polignac number, because 138766836921 - 2² = 138766836917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138766836931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1360459135 + ... + 1360459236.

It is an arithmetic number, because the mean of its divisors is an integer number (24488265348).

Almost surely, 2^138766836921 is an apocalyptic number.

It is an amenable number.

138766836921 is a deficient number, since it is larger than the sum of its proper divisors (57139285863).

138766836921 is a wasteful number, since it uses less digits than its factorization.

138766836921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2720918391.

The product of its digits is 15676416, while the sum is 60.

The spelling of 138766836921 in words is "one hundred thirty-eight billion, seven hundred sixty-six million, eight hundred thirty-six thousand, nine hundred twenty-one".