4351223531221 has 12 divisors (see below), whose sum is σ = 5062182470688. Its totient is φ = 3729211150392.

The previous prime is 4351223531209. The next prime is 4351223531227. The reversal of 4351223531221 is 1221353221534.

It is not a de Polignac number, because 4351223531221 - 2¹¹ = 4351223529173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4351223531227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4417491 + ... + 5311936.

It is an arithmetic number, because the mean of its divisors is an integer number (421848539224).

Almost surely, 2^{4351223531221} is an apocalyptic number.

It is an amenable number.

4351223531221 is a deficient number, since it is larger than the sum of its proper divisors (710958939467).

4351223531221 is an equidigital number, since it uses as much as digits as its factorization.

4351223531221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9738568 (or 9738561 counting only the distinct ones).

The product of its digits is 43200, while the sum is 34.

Adding to 4351223531221 its reverse (1221353221534), we get a palindrome (5572576752755).

The spelling of 4351223531221 in words is "four trillion, three hundred fifty-one billion, two hundred twenty-three million, five hundred thirty-one thousand, two hundred twenty-one".