4006653221 has 2 divisors, whose sum is σ = 4006653222. Its totient is φ = 4006653220.

The previous prime is 4006653193. The next prime is 4006653223. The reversal of 4006653221 is 1223566004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3649972225 + 356680996 = 60415^2 + 18886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4006653221 is a prime.

It is a Sophie Germain prime.

Together with 4006653223, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4006653223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2003326610 + 2003326611.

It is an arithmetic number, because the mean of its divisors is an integer number (2003326611).

Almost surely, 2^4006653221 is an apocalyptic number.

It is an amenable number.

4006653221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4006653221 is an equidigital number, since it uses as much as digits as its factorization.

4006653221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 4006653221 is about 63298.1296801098. The cubic root of 4006653221 is about 1588.2806752888.

The spelling of 4006653221 in words is "four billion, six million, six hundred fifty-three thousand, two hundred twenty-one".