138121411 has 2 divisors, whose sum is σ = 138121412. Its totient is φ = 138121410.

The previous prime is 138121367. The next prime is 138121427. The reversal of 138121411 is 114121831.

It is a strong prime.

It is an emirp because it is prime and its reverse (114121831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138121411 - 2⁷ = 138121283 is a prime.

It is not a weakly prime, because it can be changed into another prime (138121441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69060705 + 69060706.

It is an arithmetic number, because the mean of its divisors is an integer number (69060706).

Almost surely, 2^138121411 is an apocalyptic number.

138121411 is a deficient number, since it is larger than the sum of its proper divisors (1).

138121411 is an equidigital number, since it uses as much as digits as its factorization.

138121411 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 22.

The square root of 138121411 is about 11752.5065837038. The cubic root of 138121411 is about 516.9164289941.

The spelling of 138121411 in words is "one hundred thirty-eight million, one hundred twenty-one thousand, four hundred eleven".