321120000021 has 16 divisors (see below), whose sum is σ = 445219104960. Its totient is φ = 205626946560.

The previous prime is 321120000001. The next prime is 321120000037. The reversal of 321120000021 is 120000021123.

It is not a de Polignac number, because 321120000021 - 2²¹ = 321117902869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 321119999961 and 321120000006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321120000001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9545475 + ... + 9579056.

It is an arithmetic number, because the mean of its divisors is an integer number (27826194060).

Almost surely, 2^321120000021 is an apocalyptic number.

It is an amenable number.

321120000021 is a deficient number, since it is larger than the sum of its proper divisors (124099104939).

321120000021 is a wasteful number, since it uses less digits than its factorization.

321120000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19124756.

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

Adding to 321120000021 its reverse (120000021123), we get a palindrome (441120021144).

The spelling of 321120000021 in words is "three hundred twenty-one billion, one hundred twenty million, twenty-one", and thus it is an aban number.