4006606421 has 2 divisors, whose sum is σ = 4006606422. Its totient is φ = 4006606420.

The previous prime is 4006606379. The next prime is 4006606477. The reversal of 4006606421 is 1246066004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2810484196 + 1196122225 = 53014^2 + 34585^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4006606421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4006606481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2003303210 + 2003303211.

It is an arithmetic number, because the mean of its divisors is an integer number (2003303211).

Almost surely, 2^4006606421 is an apocalyptic number.

It is an amenable number.

4006606421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4006606421 is an equidigital number, since it uses as much as digits as its factorization.

4006606421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 4006606421 is about 63297.7599998610. The cubic root of 4006606421 is about 1588.2744912560.

The spelling of 4006606421 in words is "four billion, six million, six hundred six thousand, four hundred twenty-one".