4094039021 has 2 divisors, whose sum is σ = 4094039022. Its totient is φ = 4094039020.

The previous prime is 4094039017. The next prime is 4094039101. The reversal of 4094039021 is 1209304904.

It is a happy number.

4094039021 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., 2521044100 + 1572994921 = 50210^2 + 39661^2 .

It is a cyclic number.

It is not a de Polignac number, because 4094039021 - 2² = 4094039017 is a prime.

It is a super-2 number, since 2×4094039021² = 33522311010941276882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4094039821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2047019510 + 2047019511.

It is an arithmetic number, because the mean of its divisors is an integer number (2047019511).

Almost surely, 2^4094039021 is an apocalyptic number.

It is an amenable number.

4094039021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4094039021 is an equidigital number, since it uses as much as digits as its factorization.

4094039021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 4094039021 is about 63984.6780174754. The cubic root of 4094039021 is about 1599.7446234341.

The spelling of 4094039021 in words is "four billion, ninety-four million, thirty-nine thousand, twenty-one".