213033030221321 has 4 divisors (see below), whose sum is σ = 213392276478612. Its totient is φ = 212673783964032.

The previous prime is 213033030221273. The next prime is 213033030221339. The reversal of 213033030221321 is 123122030330312.

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 104072418124921 + 108960612096400 = 10201589^2 + 10438420^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213033030221321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213033030221371) 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, 179623127756 + ... + 179623128941.

It is an arithmetic number, because the mean of its divisors is an integer number (53348069119653).

Almost surely, 2^{213033030221321} is an apocalyptic number.

It is an amenable number.

213033030221321 is a deficient number, since it is larger than the sum of its proper divisors (359246257291).

213033030221321 is an equidigital number, since it uses as much as digits as its factorization.

213033030221321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359246257290.

The product of its (nonzero) digits is 3888, while the sum is 26.

Adding to 213033030221321 its reverse (123122030330312), we get a palindrome (336155060551633).

The spelling of 213033030221321 in words is "two hundred thirteen trillion, thirty-three billion, thirty million, two hundred twenty-one thousand, three hundred twenty-one".