321012030013021 has 4 divisors (see below), whose sum is σ = 321013653837052. Its totient is φ = 321010406188992.

The previous prime is 321012030013019. The next prime is 321012030013069. The reversal of 321012030013021 is 120310030210123.

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

It can be written as a sum of positive squares in 2 ways, for example, as 249836401013796 + 71175628999225 = 15806214^2 + 8436565^2 .

It is a cyclic number.

It is not a de Polignac number, because 321012030013021 - 2¹ = 321012030013019 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 321012030013021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321012030013621) 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, 811615446 + ... + 812010871.

It is an arithmetic number, because the mean of its divisors is an integer number (80253413459263).

Almost surely, 2^{321012030013021} is an apocalyptic number.

It is an amenable number.

321012030013021 is a deficient number, since it is larger than the sum of its proper divisors (1623824031).

321012030013021 is a wasteful number, since it uses less digits than its factorization.

321012030013021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1623824030.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 321012030013021 its reverse (120310030210123), we get a palindrome (441322060223144).

The spelling of 321012030013021 in words is "three hundred twenty-one trillion, twelve billion, thirty million, thirteen thousand, twenty-one".