138262625021 has 2 divisors, whose sum is σ = 138262625022. Its totient is φ = 138262625020.

The previous prime is 138262624991. The next prime is 138262625051. The reversal of 138262625021 is 120526262831.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (138262624991) and next prime (138262625051).

It can be written as a sum of positive squares in only one way, i.e., 122440507225 + 15822117796 = 349915^2 + 125786^2 .

It is a cyclic number.

It is not a de Polignac number, because 138262625021 - 2⁶ = 138262624957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138262625051) 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 as a sum of consecutive naturals, namely, 69131312510 + 69131312511.

It is an arithmetic number, because the mean of its divisors is an integer number (69131312511).

Almost surely, 2^138262625021 is an apocalyptic number.

It is an amenable number.

138262625021 is a deficient number, since it is larger than the sum of its proper divisors (1).

138262625021 is an equidigital number, since it uses as much as digits as its factorization.

138262625021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 38.

Adding to 138262625021 its reverse (120526262831), we get a palindrome (258788887852).

The spelling of 138262625021 in words is "one hundred thirty-eight billion, two hundred sixty-two million, six hundred twenty-five thousand, twenty-one".