4004240402021 has 2 divisors, whose sum is σ = 4004240402022. Its totient is φ = 4004240402020.

The previous prime is 4004240401981. The next prime is 4004240402023. The reversal of 4004240402021 is 1202040424004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3079779304900 + 924461097121 = 1754930^2 + 961489^2 .

It is a cyclic number.

It is not a de Polignac number, because 4004240402021 - 2¹⁸ = 4004240139877 is a prime.

Together with 4004240402023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4004240402023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2002120201010 + 2002120201011.

It is an arithmetic number, because the mean of its divisors is an integer number (2002120201011).

Almost surely, 2^{4004240402021} is an apocalyptic number.

It is an amenable number.

4004240402021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4004240402021 is an equidigital number, since it uses as much as digits as its factorization.

4004240402021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2048, while the sum is 23.

Adding to 4004240402021 its reverse (1202040424004), we get a palindrome (5206280826025).

The spelling of 4004240402021 in words is "four trillion, four billion, two hundred forty million, four hundred two thousand, twenty-one".