4021402009 has 2 divisors, whose sum is σ = 4021402010. Its totient is φ = 4021402008.

The previous prime is 4021402001. The next prime is 4021402031. The reversal of 4021402009 is 9002041204.

It is an a-pointer prime, because the next prime (4021402031) can be obtained adding 4021402009 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3993608025 + 27793984 = 63195^2 + 5272^2 .

It is a cyclic number.

It is not a de Polignac number, because 4021402009 - 2³ = 4021402001 is a prime.

It is not a weakly prime, because it can be changed into another prime (4021402001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010701004 + 2010701005.

It is an arithmetic number, because the mean of its divisors is an integer number (2010701005).

Almost surely, 2^4021402009 is an apocalyptic number.

It is an amenable number.

4021402009 is a deficient number, since it is larger than the sum of its proper divisors (1).

4021402009 is an equidigital number, since it uses as much as digits as its factorization.

4021402009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 4021402009 is about 63414.5252209618. The cubic root of 4021402009 is about 1590.2271485665.

The spelling of 4021402009 in words is "four billion, twenty-one million, four hundred two thousand, nine".