3884021221 has 2 divisors, whose sum is σ = 3884021222. Its totient is φ = 3884021220.

The previous prime is 3884021209. The next prime is 3884021231. The reversal of 3884021221 is 1221204883.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3227944225 + 656076996 = 56815^2 + 25614^2 .

It is a cyclic number.

It is not a de Polignac number, because 3884021221 - 2⁵ = 3884021189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3884021231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1942010610 + 1942010611.

It is an arithmetic number, because the mean of its divisors is an integer number (1942010611).

Almost surely, 2^3884021221 is an apocalyptic number.

It is an amenable number.

3884021221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3884021221 is an equidigital number, since it uses as much as digits as its factorization.

3884021221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 3884021221 is about 62321.9160568736. The cubic root of 3884021221 is about 1571.9082670919.

The spelling of 3884021221 in words is "three billion, eight hundred eighty-four million, twenty-one thousand, two hundred twenty-one".