21212020220213 has 2 divisors, whose sum is σ = 21212020220214. Its totient is φ = 21212020220212.

The previous prime is 21212020220201. The next prime is 21212020220227. The reversal of 21212020220213 is 31202202021212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18434674647844 + 2777345572369 = 4293562^2 + 1666537^2 .

It is a cyclic number.

It is not a de Polignac number, because 21212020220213 - 2¹⁰ = 21212020219189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21212020220113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606010110106 + 10606010110107.

It is an arithmetic number, because the mean of its divisors is an integer number (10606010110107).

Almost surely, 2^{21212020220213} is an apocalyptic number.

It is an amenable number.

21212020220213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212020220213 is an equidigital number, since it uses as much as digits as its factorization.

21212020220213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21212020220213 its reverse (31202202021212), we get a palindrome (52414222241425).

The spelling of 21212020220213 in words is "twenty-one trillion, two hundred twelve billion, twenty million, two hundred twenty thousand, two hundred thirteen".