321121012021 has 8 divisors (see below), whose sum is σ = 322337047320. Its totient is φ = 319905142272.

The previous prime is 321121012019. The next prime is 321121012031. The reversal of 321121012021 is 120210121123.

It can be written as a sum of positive squares in 4 ways, for example, as 105876048996 + 215244963025 = 325386^2 + 463945^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 321121012021 - 2¹ = 321121012019 is a prime.

It is a super-2 number, since 2×321121012021² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321121011986 and 321121012004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321121012031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5001901 + ... + 5065693.

It is an arithmetic number, because the mean of its divisors is an integer number (40292130915).

Almost surely, 2^321121012021 is an apocalyptic number.

It is an amenable number.

321121012021 is a deficient number, since it is larger than the sum of its proper divisors (1216035299).

321121012021 is a wasteful number, since it uses less digits than its factorization.

321121012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82775.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 321121012021 its reverse (120210121123), we get a palindrome (441331133144).

The spelling of 321121012021 in words is "three hundred twenty-one billion, one hundred twenty-one million, twelve thousand, twenty-one".