4252139921 has 2 divisors, whose sum is σ = 4252139922. Its totient is φ = 4252139920.

The previous prime is 4252139911. The next prime is 4252139951. The reversal of 4252139921 is 1299312524.

It is a happy number.

4252139921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3830248321 + 421891600 = 61889^2 + 20540^2 .

It is a cyclic number.

It is not a de Polignac number, because 4252139921 - 2¹⁴ = 4252123537 is a prime.

It is not a weakly prime, because it can be changed into another prime (4252139911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2126069960 + 2126069961.

It is an arithmetic number, because the mean of its divisors is an integer number (2126069961).

Almost surely, 2^4252139921 is an apocalyptic number.

It is an amenable number.

4252139921 is a deficient number, since it is larger than the sum of its proper divisors (1).

4252139921 is an equidigital number, since it uses as much as digits as its factorization.

4252139921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 38.

The square root of 4252139921 is about 65208.4344314445. The cubic root of 4252139921 is about 1620.0777182905.

The spelling of 4252139921 in words is "four billion, two hundred fifty-two million, one hundred thirty-nine thousand, nine hundred twenty-one".