321550221145 has 16 divisors (see below), whose sum is σ = 387874840320. Its totient is φ = 255899893824.

The previous prime is 321550221133. The next prime is 321550221173. The reversal of 321550221145 is 541122055123.

It is a cyclic number.

It is not a de Polignac number, because 321550221145 - 2³³ = 312960286553 is a prime.

It is a super-2 number, since 2×321550221145² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 759892 + ... + 1104778.

It is an arithmetic number, because the mean of its divisors is an integer number (24242177520).

Almost surely, 2^321550221145 is an apocalyptic number.

It is an amenable number.

321550221145 is a deficient number, since it is larger than the sum of its proper divisors (66324619175).

321550221145 is a wasteful number, since it uses less digits than its factorization.

321550221145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345864.

The product of its (nonzero) digits is 12000, while the sum is 31.

Adding to 321550221145 its reverse (541122055123), we get a palindrome (862672276268).

The spelling of 321550221145 in words is "three hundred twenty-one billion, five hundred fifty million, two hundred twenty-one thousand, one hundred forty-five".