21101210213 has 2 divisors, whose sum is σ = 21101210214. Its totient is φ = 21101210212.

The previous prime is 21101210201. The next prime is 21101210227. The reversal of 21101210213 is 31201210112.

It is an a-pointer prime, because the next prime (21101210227) can be obtained adding 21101210213 to its sum of digits (14).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16025787649 + 5075422564 = 126593^2 + 71242^2 .

It is a cyclic number.

It is not a de Polignac number, because 21101210213 - 2⁸ = 21101209957 is a prime.

It is a super-2 number, since 2×21101210213² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21101210243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550605106 + 10550605107.

It is an arithmetic number, because the mean of its divisors is an integer number (10550605107).

Almost surely, 2^21101210213 is an apocalyptic number.

It is an amenable number.

21101210213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101210213 is an equidigital number, since it uses as much as digits as its factorization.

21101210213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21101210213 its reverse (31201210112), we get a palindrome (52302420325).

The spelling of 21101210213 in words is "twenty-one billion, one hundred one million, two hundred ten thousand, two hundred thirteen".