4000002421 has 2 divisors, whose sum is σ = 4000002422. Its totient is φ = 4000002420.

The previous prime is 4000002389. The next prime is 4000002431. The reversal of 4000002421 is 1242000004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3305100100 + 694902321 = 57490^2 + 26361^2 .

It is a cyclic number.

It is not a de Polignac number, because 4000002421 - 2⁵ = 4000002389 is a prime.

It is a super-2 number, since 2×4000002421² = 32000038736011722482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4000002431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2000001210 + 2000001211.

It is an arithmetic number, because the mean of its divisors is an integer number (2000001211).

Almost surely, 2^4000002421 is an apocalyptic number.

It is an amenable number.

4000002421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4000002421 is an equidigital number, since it uses as much as digits as its factorization.

4000002421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 4000002421 is about 63245.5723430502. The cubic root of 4000002421 is about 1587.4013722263.

Adding to 4000002421 its reverse (1242000004), we get a palindrome (5242002425).

The spelling of 4000002421 in words is "four billion, two thousand, four hundred twenty-one".