21302012213 has 2 divisors, whose sum is σ = 21302012214. Its totient is φ = 21302012212.

The previous prime is 21302012209. The next prime is 21302012323. The reversal of 21302012213 is 31221020312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19807184644 + 1494827569 = 140738^2 + 38663^2 .

It is a cyclic number.

It is not a de Polignac number, because 21302012213 - 2² = 21302012209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21302012191 and 21302012200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21302015213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651006106 + 10651006107.

It is an arithmetic number, because the mean of its divisors is an integer number (10651006107).

Almost surely, 2^21302012213 is an apocalyptic number.

It is an amenable number.

21302012213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21302012213 is an equidigital number, since it uses as much as digits as its factorization.

21302012213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21302012213 its reverse (31221020312), we get a palindrome (52523032525).

The spelling of 21302012213 in words is "twenty-one billion, three hundred two million, twelve thousand, two hundred thirteen".