321220213222001 has 4 divisors (see below), whose sum is σ = 324062869976292. Its totient is φ = 318377556467712.

The previous prime is 321220213221983. The next prime is 321220213222019. The reversal of 321220213222001 is 100222312022123.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (321220213221983) and next prime (321220213222019).

It can be written as a sum of positive squares in 2 ways, for example, as 1563002540401 + 319657210681600 = 1250201^2 + 17878960^2 .

It is a cyclic number.

It is not a de Polignac number, because 321220213222001 - 2¹⁸ = 321220212959857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321220213222021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1421328376976 + ... + 1421328377201.

It is an arithmetic number, because the mean of its divisors is an integer number (81015717494073).

Almost surely, 2^{321220213222001} is an apocalyptic number.

It is an amenable number.

321220213222001 is a deficient number, since it is larger than the sum of its proper divisors (2842656754291).

321220213222001 is a wasteful number, since it uses less digits than its factorization.

321220213222001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2842656754290.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 321220213222001 its reverse (100222312022123), we get a palindrome (421442525244124).

The spelling of 321220213222001 in words is "three hundred twenty-one trillion, two hundred twenty billion, two hundred thirteen million, two hundred twenty-two thousand, one".