320121213121221 has 16 divisors (see below), whose sum is σ = 432267860213760. Its totient is φ = 210694812634800.

The previous prime is 320121213121217. The next prime is 320121213121271. The reversal of 320121213121221 is 122121312121023.

It is not a de Polignac number, because 320121213121221 - 2² = 320121213121217 is a prime.

It is a super-2 number, since 2×320121213121221² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 320121213121191 and 320121213121200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320121213121201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54524005 + ... + 60109146.

It is an arithmetic number, because the mean of its divisors is an integer number (27016741263360).

Almost surely, 2^{320121213121221} is an apocalyptic number.

It is an amenable number.

320121213121221 is a deficient number, since it is larger than the sum of its proper divisors (112146647092539).

320121213121221 is a wasteful number, since it uses less digits than its factorization.

320121213121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114645016.

The product of its (nonzero) digits is 576, while the sum is 24.

Adding to 320121213121221 its reverse (122121312121023), we get a palindrome (442242525242244).

The spelling of 320121213121221 in words is "three hundred twenty trillion, one hundred twenty-one billion, two hundred thirteen million, one hundred twenty-one thousand, two hundred twenty-one".