21010302213 has 4 divisors (see below), whose sum is σ = 28013736288. Its totient is φ = 14006868140.

The previous prime is 21010302199. The next prime is 21010302221. The reversal of 21010302213 is 31220301012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21010302213 - 2¹³ = 21010294021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21010302192 and 21010302201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010302233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3501717033 + ... + 3501717038.

It is an arithmetic number, because the mean of its divisors is an integer number (7003434072).

Almost surely, 2^21010302213 is an apocalyptic number.

It is an amenable number.

21010302213 is a deficient number, since it is larger than the sum of its proper divisors (7003434075).

21010302213 is an equidigital number, since it uses as much as digits as its factorization.

21010302213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7003434074.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21010302213 its reverse (31220301012), we get a palindrome (52230603225).

The spelling of 21010302213 in words is "twenty-one billion, ten million, three hundred two thousand, two hundred thirteen".