3864237197221 has 2 divisors, whose sum is σ = 3864237197222. Its totient is φ = 3864237197220.

The previous prime is 3864237197159. The next prime is 3864237197239. The reversal of 3864237197221 is 1227917324683.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2963045822500 + 901191374721 = 1721350^2 + 949311^2 .

It is a cyclic number.

It is not a de Polignac number, because 3864237197221 - 2¹¹ = 3864237195173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3864237197291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1932118598610 + 1932118598611.

It is an arithmetic number, because the mean of its divisors is an integer number (1932118598611).

Almost surely, 2^{3864237197221} is an apocalyptic number.

It is an amenable number.

3864237197221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3864237197221 is an equidigital number, since it uses as much as digits as its factorization.

3864237197221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6096384, while the sum is 55.

The spelling of 3864237197221 in words is "three trillion, eight hundred sixty-four billion, two hundred thirty-seven million, one hundred ninety-seven thousand, two hundred twenty-one".