2138321407 has 2 divisors, whose sum is σ = 2138321408. Its totient is φ = 2138321406.

The previous prime is 2138321371. The next prime is 2138321473. The reversal of 2138321407 is 7041238312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2138321407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2138325407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069160703 + 1069160704.

It is an arithmetic number, because the mean of its divisors is an integer number (1069160704).

Almost surely, 2^2138321407 is an apocalyptic number.

2138321407 is a deficient number, since it is larger than the sum of its proper divisors (1).

2138321407 is an equidigital number, since it uses as much as digits as its factorization.

2138321407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 2138321407 is about 46241.9874897263. The cubic root of 2138321407 is about 1288.3217177180.

Adding to 2138321407 its reverse (7041238312), we get a palindrome (9179559719).

The spelling of 2138321407 in words is "two billion, one hundred thirty-eight million, three hundred twenty-one thousand, four hundred seven".