4321221164521 has 8 divisors (see below), whose sum is σ = 4335538049024. Its totient is φ = 4306907535840.

The previous prime is 4321221164483. The next prime is 4321221164537. The reversal of 4321221164521 is 1254611221234.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4321221164521 - 2⁹ = 4321221164009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4321221164591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1859416 + ... + 3478486.

It is an arithmetic number, because the mean of its divisors is an integer number (541942256128).

Almost surely, 2^{4321221164521} is an apocalyptic number.

It is an amenable number.

4321221164521 is a deficient number, since it is larger than the sum of its proper divisors (14316884503).

4321221164521 is a wasteful number, since it uses less digits than its factorization.

4321221164521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1627911.

The product of its digits is 23040, while the sum is 34.

Adding to 4321221164521 its reverse (1254611221234), we get a palindrome (5575832385755).

The spelling of 4321221164521 in words is "four trillion, three hundred twenty-one billion, two hundred twenty-one million, one hundred sixty-four thousand, five hundred twenty-one".