138340231214921 has 8 divisors (see below), whose sum is σ = 138392297455104. Its totient is φ = 138288168514080.

The previous prime is 138340231214909. The next prime is 138340231215007. The reversal of 138340231214921 is 129412132043831.

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 138340231214921 - 2³⁸ = 138065353307977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138340231219921) 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, 78645536 + ... + 80385326.

It is an arithmetic number, because the mean of its divisors is an integer number (17299037181888).

Almost surely, 2^{138340231214921} is an apocalyptic number.

It is an amenable number.

138340231214921 is a deficient number, since it is larger than the sum of its proper divisors (52066240183).

138340231214921 is a wasteful number, since it uses less digits than its factorization.

138340231214921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1769671.

The product of its (nonzero) digits is 248832, while the sum is 44.

The spelling of 138340231214921 in words is "one hundred thirty-eight trillion, three hundred forty billion, two hundred thirty-one million, two hundred fourteen thousand, nine hundred twenty-one".