321420031400021 has 16 divisors (see below), whose sum is σ = 325127025347904. Its totient is φ = 317726092445184.

The previous prime is 321420031400011. The next prime is 321420031400033. The reversal of 321420031400021 is 120004130024123.

It is a cyclic number.

It is not a de Polignac number, because 321420031400021 - 2¹⁰ = 321420031398997 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 321420031400021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321420031400011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3108669701 + ... + 3108773093.

It is an arithmetic number, because the mean of its divisors is an integer number (20320439084244).

Almost surely, 2^{321420031400021} is an apocalyptic number.

It is an amenable number.

321420031400021 is a deficient number, since it is larger than the sum of its proper divisors (3706993947883).

321420031400021 is a wasteful number, since it uses less digits than its factorization.

321420031400021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166180.

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

Adding to 321420031400021 its reverse (120004130024123), we get a palindrome (441424161424144).

The spelling of 321420031400021 in words is "three hundred twenty-one trillion, four hundred twenty billion, thirty-one million, four hundred thousand, twenty-one".