221021110213 has 2 divisors, whose sum is σ = 221021110214. Its totient is φ = 221021110212.

The previous prime is 221021110207. The next prime is 221021110249. The reversal of 221021110213 is 312011120122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130550697124 + 90470413089 = 361318^2 + 300783^2 .

It is a cyclic number.

It is not a de Polignac number, because 221021110213 - 2¹³ = 221021102021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221021120213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110510555106 + 110510555107.

It is an arithmetic number, because the mean of its divisors is an integer number (110510555107).

Almost surely, 2^221021110213 is an apocalyptic number.

It is an amenable number.

221021110213 is a deficient number, since it is larger than the sum of its proper divisors (1).

221021110213 is an equidigital number, since it uses as much as digits as its factorization.

221021110213 is an evil number, because the sum of its binary digits is even.

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

Adding to 221021110213 its reverse (312011120122), we get a palindrome (533032230335).

Subtracting 221021110213 from its reverse (312011120122), we obtain a palindrome (90990009909).

The spelling of 221021110213 in words is "two hundred twenty-one billion, twenty-one million, one hundred ten thousand, two hundred thirteen".