3543121221 has 12 divisors (see below), whose sum is σ = 4855298112. Its totient is φ = 2298238128.

The previous prime is 3543121217. The next prime is 3543121279. The reversal of 3543121221 is 1221213453.

It is not a de Polignac number, because 3543121221 - 2² = 3543121217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3543121191 and 3543121200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3543121201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 427245 + ... + 435458.

It is an arithmetic number, because the mean of its divisors is an integer number (404608176).

Almost surely, 2^3543121221 is an apocalyptic number.

It is an amenable number.

3543121221 is a deficient number, since it is larger than the sum of its proper divisors (1312176891).

3543121221 is an equidigital number, since it uses as much as digits as its factorization.

3543121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862780 (or 862743 counting only the distinct ones).

The product of its digits is 1440, while the sum is 24.

The square root of 3543121221 is about 59524.1230174792. The cubic root of 3543121221 is about 1524.5043586456.

Adding to 3543121221 its reverse (1221213453), we get a palindrome (4764334674).

The spelling of 3543121221 in words is "three billion, five hundred forty-three million, one hundred twenty-one thousand, two hundred twenty-one".