321220101 has 4 divisors (see below), whose sum is σ = 428293472. Its totient is φ = 214146732.

The previous prime is 321220087. The next prime is 321220103. The reversal of 321220101 is 101022123.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 101022123 = 3 ⋅33674041.

It is not a de Polignac number, because 321220101 - 2¹⁵ = 321187333 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 (321220103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53536681 + ... + 53536686.

It is an arithmetic number, because the mean of its divisors is an integer number (107073368).

Almost surely, 2^321220101 is an apocalyptic number.

It is an amenable number.

321220101 is a deficient number, since it is larger than the sum of its proper divisors (107073371).

321220101 is a wasteful number, since it uses less digits than its factorization.

321220101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107073370.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 321220101 is about 17922.6142345362. The cubic root of 321220101 is about 684.8585859002.

Adding to 321220101 its reverse (101022123), we get a palindrome (422242224).

The spelling of 321220101 in words is "three hundred twenty-one million, two hundred twenty thousand, one hundred one".