21010300213 has 6 divisors (see below), whose sum is σ = 24440553366. Its totient is φ = 18008828712.

The previous prime is 21010300169. The next prime is 21010300217. The reversal of 21010300213 is 31200301012.

It can be written as a sum of positive squares in only one way, i.e., 11441939089 + 9568361124 = 106967^2 + 97818^2 .

It is not a de Polignac number, because 21010300213 - 2¹³ = 21010292021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21010300193 and 21010300202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010300217) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 214390770 + ... + 214390867.

It is an arithmetic number, because the mean of its divisors is an integer number (4073425561).

Almost surely, 2^21010300213 is an apocalyptic number.

It is an amenable number.

21010300213 is a deficient number, since it is larger than the sum of its proper divisors (3430253153).

21010300213 is an equidigital number, since it uses as much as digits as its factorization.

21010300213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428781651 (or 428781644 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21010300213 its reverse (31200301012), we get a palindrome (52210601225).

The spelling of 21010300213 in words is "twenty-one billion, ten million, three hundred thousand, two hundred thirteen".