138114421 has 2 divisors, whose sum is σ = 138114422. Its totient is φ = 138114420.

The previous prime is 138114419. The next prime is 138114437. The reversal of 138114421 is 124411831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99500625 + 38613796 = 9975^2 + 6214^2 .

It is a cyclic number.

It is not a de Polignac number, because 138114421 - 2¹ = 138114419 is a prime.

Together with 138114419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138114721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69057210 + 69057211.

It is an arithmetic number, because the mean of its divisors is an integer number (69057211).

Almost surely, 2^138114421 is an apocalyptic number.

It is an amenable number.

138114421 is a deficient number, since it is larger than the sum of its proper divisors (1).

138114421 is an equidigital number, since it uses as much as digits as its factorization.

138114421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 768, while the sum is 25.

The square root of 138114421 is about 11752.2091965724. The cubic root of 138114421 is about 516.9077088718.

The spelling of 138114421 in words is "one hundred thirty-eight million, one hundred fourteen thousand, four hundred twenty-one".