321221011213 has 4 divisors (see below), whose sum is σ = 321228783900. Its totient is φ = 321213238528.

The previous prime is 321221011201. The next prime is 321221011277. The reversal of 321221011213 is 312110122123.

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 138710063844 + 182510947369 = 372438^2 + 427213^2 .

It is a cyclic number.

It is not a de Polignac number, because 321221011213 - 2²¹ = 321218914061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321221011613) 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, 3824020 + ... + 3907117.

It is an arithmetic number, because the mean of its divisors is an integer number (80307195975).

Almost surely, 2^321221011213 is an apocalyptic number.

It is an amenable number.

321221011213 is a deficient number, since it is larger than the sum of its proper divisors (7772687).

321221011213 is an equidigital number, since it uses as much as digits as its factorization.

321221011213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7772686.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 321221011213 its reverse (312110122123), we get a palindrome (633331133336).

The spelling of 321221011213 in words is "three hundred twenty-one billion, two hundred twenty-one million, eleven thousand, two hundred thirteen".