21230102213 has 4 divisors (see below), whose sum is σ = 21236261100. Its totient is φ = 21223943328.

The previous prime is 21230102203. The next prime is 21230102237. The reversal of 21230102213 is 31220103212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 489205924 + 20740896289 = 22118^2 + 144017^2 .

It is a cyclic number.

It is not a de Polignac number, because 21230102213 - 2⁶ = 21230102149 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21230102191 and 21230102200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230102203) 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, 3074270 + ... + 3081167.

It is an arithmetic number, because the mean of its divisors is an integer number (5309065275).

Almost surely, 2^21230102213 is an apocalyptic number.

It is an amenable number.

21230102213 is a deficient number, since it is larger than the sum of its proper divisors (6158887).

21230102213 is an equidigital number, since it uses as much as digits as its factorization.

21230102213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6158886.

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

Adding to 21230102213 its reverse (31220103212), we get a palindrome (52450205425).

Subtracting 21230102213 from its reverse (31220103212), we obtain a palindrome (9990000999).

The spelling of 21230102213 in words is "twenty-one billion, two hundred thirty million, one hundred two thousand, two hundred thirteen".