3666201421 has 2 divisors, whose sum is σ = 3666201422. Its totient is φ = 3666201420.

The previous prime is 3666201397. The next prime is 3666201433. The reversal of 3666201421 is 1241026663.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3658556196 + 7645225 = 60486^2 + 2765^2 .

It is a cyclic number.

It is not a de Polignac number, because 3666201421 - 2²⁹ = 3129330509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3666241421) 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, 1833100710 + 1833100711.

It is an arithmetic number, because the mean of its divisors is an integer number (1833100711).

Almost surely, 2^3666201421 is an apocalyptic number.

It is an amenable number.

3666201421 is a deficient number, since it is larger than the sum of its proper divisors (1).

3666201421 is an equidigital number, since it uses as much as digits as its factorization.

3666201421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 3666201421 is about 60549.1653204237. The cubic root of 3666201421 is about 1541.9564470689.

The spelling of 3666201421 in words is "three billion, six hundred sixty-six million, two hundred one thousand, four hundred twenty-one".