2138421529 has 2 divisors, whose sum is σ = 2138421530. Its totient is φ = 2138421528.

The previous prime is 2138421479. The next prime is 2138421539. The reversal of 2138421529 is 9251248312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1767782025 + 370639504 = 42045^2 + 19252^2 .

It is a cyclic number.

It is not a de Polignac number, because 2138421529 - 2⁹ = 2138421017 is a prime.

It is not a weakly prime, because it can be changed into another prime (2138421539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069210764 + 1069210765.

It is an arithmetic number, because the mean of its divisors is an integer number (1069210765).

Almost surely, 2^2138421529 is an apocalyptic number.

It is an amenable number.

2138421529 is a deficient number, since it is larger than the sum of its proper divisors (1).

2138421529 is an equidigital number, since it uses as much as digits as its factorization.

2138421529 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 37.

The square root of 2138421529 is about 46243.0700646054. The cubic root of 2138421529 is about 1288.3418249749.

The spelling of 2138421529 in words is "two billion, one hundred thirty-eight million, four hundred twenty-one thousand, five hundred twenty-nine".