3201220421 has 6 divisors (see below), whose sum is σ = 3723868710. Its totient is φ = 2743903176.

The previous prime is 3201220409. The next prime is 3201220433. The reversal of 3201220421 is 1240221023.

It is an interprime number because it is at equal distance from previous prime (3201220409) and next prime (3201220433).

It can be written as a sum of positive squares in only one way, i.e., 3175322500 + 25897921 = 56350^2 + 5089^2 .

It is not a de Polignac number, because 3201220421 - 2²² = 3197026117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3201220421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3201220021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 32665466 + ... + 32665563.

It is an arithmetic number, because the mean of its divisors is an integer number (620644785).

Almost surely, 2^3201220421 is an apocalyptic number.

It is an amenable number.

3201220421 is a deficient number, since it is larger than the sum of its proper divisors (522648289).

3201220421 is an equidigital number, since it uses as much as digits as its factorization.

3201220421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65331043 (or 65331036 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 3201220421 is about 56579.3285661822. The cubic root of 3201220421 is about 1473.7999118709.

Adding to 3201220421 its reverse (1240221023), we get a palindrome (4441441444).

The spelling of 3201220421 in words is "three billion, two hundred one million, two hundred twenty thousand, four hundred twenty-one".