138057007021 has 32 divisors (see below), whose sum is σ = 153487319040. Its totient is φ = 123577767936.

The previous prime is 138057006991. The next prime is 138057007027. The reversal of 138057007021 is 120700750831.

It is a cyclic number.

It is not a de Polignac number, because 138057007021 - 2¹¹ = 138057004973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138057007027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34799380 + ... + 34803346.

It is an arithmetic number, because the mean of its divisors is an integer number (4796478720).

Almost surely, 2^138057007021 is an apocalyptic number.

It is an amenable number.

138057007021 is a deficient number, since it is larger than the sum of its proper divisors (15430312019).

138057007021 is a wasteful number, since it uses less digits than its factorization.

138057007021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5053.

The product of its (nonzero) digits is 11760, while the sum is 34.

Adding to 138057007021 its reverse (120700750831), we get a palindrome (258757757852).

The spelling of 138057007021 in words is "one hundred thirty-eight billion, fifty-seven million, seven thousand, twenty-one".