321103000021 has 4 divisors (see below), whose sum is σ = 331461161344. Its totient is φ = 310744838700.

The previous prime is 321102999991. The next prime is 321103000067. The reversal of 321103000021 is 120000301123.

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.

It is a cyclic number.

It is not a de Polignac number, because 321103000021 - 2¹¹ = 321102997973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321102999965 and 321103000010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321103040021) 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, 5179080615 + ... + 5179080676.

It is an arithmetic number, because the mean of its divisors is an integer number (82865290336).

Almost surely, 2^321103000021 is an apocalyptic number.

321103000021 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

321103000021 is a deficient number, since it is larger than the sum of its proper divisors (10358161323).

321103000021 is a wasteful number, since it uses less digits than its factorization.

321103000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10358161322.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 321103000021 its reverse (120000301123), we get a palindrome (441103301144).

The spelling of 321103000021 in words is "three hundred twenty-one billion, one hundred three million, twenty-one", and thus it is an aban number.