3421421221 has 4 divisors (see below), whose sum is σ = 3421547244. Its totient is φ = 3421295200.

The previous prime is 3421421209. The next prime is 3421421239. The reversal of 3421421221 is 1221241243.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2126500996 + 1294920225 = 46114^2 + 35985^2 .

It is a cyclic number.

It is not a de Polignac number, because 3421421221 - 2⁷ = 3421421093 is a prime.

It is a super-2 number, since 2×3421421221² = 23412246343018261682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3421421192 and 3421421201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3421461221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3640 + ... + 82801.

It is an arithmetic number, because the mean of its divisors is an integer number (855386811).

Almost surely, 2^3421421221 is an apocalyptic number.

It is an amenable number.

3421421221 is a deficient number, since it is larger than the sum of its proper divisors (126023).

3421421221 is an equidigital number, since it uses as much as digits as its factorization.

3421421221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126022.

The product of its digits is 768, while the sum is 22.

The square root of 3421421221 is about 58492.9159898872. The cubic root of 3421421221 is about 1506.8459259253.

Adding to 3421421221 its reverse (1221241243), we get a palindrome (4642662464).

The spelling of 3421421221 in words is "three billion, four hundred twenty-one million, four hundred twenty-one thousand, two hundred twenty-one".