321000220021 has 8 divisors (see below), whose sum is σ = 345697483320. Its totient is φ = 296303662272.

The previous prime is 321000220003. The next prime is 321000220049. The reversal of 321000220021 is 120022000123.

It can be written as a sum of positive squares in 4 ways, for example, as 167817219025 + 153183000996 = 409655^2 + 391386^2 .

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 321000220021 - 2¹¹ = 321000217973 is a prime.

It is a super-2 number, since 2×321000220021² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321000219983 and 321000220010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321000220081) 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, 1123251 + ... + 1379743.

It is an arithmetic number, because the mean of its divisors is an integer number (43212185415).

Almost surely, 2^321000220021 is an apocalyptic number.

It is an amenable number.

321000220021 is a deficient number, since it is larger than the sum of its proper divisors (24697263299).

321000220021 is a wasteful number, since it uses less digits than its factorization.

321000220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352775.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 321000220021 its reverse (120022000123), we get a palindrome (441022220144).

The spelling of 321000220021 in words is "three hundred twenty-one billion, two hundred twenty thousand, twenty-one".