4392142921 has 2 divisors, whose sum is σ = 4392142922. Its totient is φ = 4392142920.

The previous prime is 4392142891. The next prime is 4392142987. The reversal of 4392142921 is 1292412934.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3388520521 + 1003622400 = 58211^2 + 31680^2 .

It is a cyclic number.

It is not a de Polignac number, because 4392142921 - 2⁷ = 4392142793 is a prime.

It is not a weakly prime, because it can be changed into another prime (4392142021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2196071460 + 2196071461.

It is an arithmetic number, because the mean of its divisors is an integer number (2196071461).

Almost surely, 2^4392142921 is an apocalyptic number.

It is an amenable number.

4392142921 is a deficient number, since it is larger than the sum of its proper divisors (1).

4392142921 is an equidigital number, since it uses as much as digits as its factorization.

4392142921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 37.

The square root of 4392142921 is about 66273.2443826315. The cubic root of 4392142921 is about 1637.6665855115. Note that the first 3 decimals are identical.

The spelling of 4392142921 in words is "four billion, three hundred ninety-two million, one hundred forty-two thousand, nine hundred twenty-one".