21220001213 has 2 divisors, whose sum is σ = 21220001214. Its totient is φ = 21220001212.

The previous prime is 21220001197. The next prime is 21220001219. The reversal of 21220001213 is 31210002212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13256759044 + 7963242169 = 115138^2 + 89237^2 .

It is a cyclic number.

It is not a de Polignac number, because 21220001213 - 2⁴ = 21220001197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21220001219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610000606 + 10610000607.

It is an arithmetic number, because the mean of its divisors is an integer number (10610000607).

Almost surely, 2^21220001213 is an apocalyptic number.

It is an amenable number.

21220001213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220001213 is an equidigital number, since it uses as much as digits as its factorization.

21220001213 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 14.

Adding to 21220001213 its reverse (31210002212), we get a palindrome (52430003425).

Subtracting 21220001213 from its reverse (31210002212), we obtain a palindrome (9990000999).

The spelling of 21220001213 in words is "twenty-one billion, two hundred twenty million, one thousand, two hundred thirteen".