321220121545 has 8 divisors (see below), whose sum is σ = 385615264320. Its totient is φ = 256875351600.

The previous prime is 321220121533. The next prime is 321220121549. The reversal of 321220121545 is 545121022123.

It is a happy number.

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

It is not a de Polignac number, because 321220121545 - 2⁵ = 321220121513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (321220121549) 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, 12579175 + ... + 12604684.

It is an arithmetic number, because the mean of its divisors is an integer number (48201908040).

Almost surely, 2^321220121545 is an apocalyptic number.

It is an amenable number.

321220121545 is a deficient number, since it is larger than the sum of its proper divisors (64395142775).

321220121545 is a wasteful number, since it uses less digits than its factorization.

321220121545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25186415.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 321220121545 its reverse (545121022123), we get a palindrome (866341143668).

The spelling of 321220121545 in words is "three hundred twenty-one billion, two hundred twenty million, one hundred twenty-one thousand, five hundred forty-five".