321220135421 has 8 divisors (see below), whose sum is σ = 321441151680. Its totient is φ = 320999192992.

The previous prime is 321220135403. The next prime is 321220135427. The reversal of 321220135421 is 124531022123.

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 321220135421 - 2¹⁸ = 321219873277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321220135427) 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, 10735760 + ... + 10765638.

It is an arithmetic number, because the mean of its divisors is an integer number (40180143960).

Almost surely, 2^321220135421 is an apocalyptic number.

It is an amenable number.

321220135421 is a deficient number, since it is larger than the sum of its proper divisors (221016259).

321220135421 is a wasteful number, since it uses less digits than its factorization.

321220135421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36915.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 321220135421 its reverse (124531022123), we get a palindrome (445751157544).

The spelling of 321220135421 in words is "three hundred twenty-one billion, two hundred twenty million, one hundred thirty-five thousand, four hundred twenty-one".