138303021 has 16 divisors (see below), whose sum is σ = 188305920. Its totient is φ = 90264240.

The previous prime is 138302977. The next prime is 138303029. The reversal of 138303021 is 120303831.

It is a happy number.

138303021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138303021 - 2⁷ = 138302893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138303029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45066 + ... + 48036.

It is an arithmetic number, because the mean of its divisors is an integer number (11769120).

Almost surely, 2^138303021 is an apocalyptic number.

It is an amenable number.

138303021 is a deficient number, since it is larger than the sum of its proper divisors (50002899).

138303021 is a wasteful number, since it uses less digits than its factorization.

138303021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3296.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 138303021 is about 11760.2304824353. The cubic root of 138303021 is about 517.1428869511.

Adding to 138303021 its reverse (120303831), we get a palindrome (258606852).

The spelling of 138303021 in words is "one hundred thirty-eight million, three hundred three thousand, twenty-one".