21230112133213 has 4 divisors (see below), whose sum is σ = 21230122193980. Its totient is φ = 21230102072448.

The previous prime is 21230112133151. The next prime is 21230112133273. The reversal of 21230112133213 is 31233121103212.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 8659024234884 + 12571087898329 = 2942622^2 + 3545573^2 .

It is a cyclic number.

It is not a de Polignac number, because 21230112133213 - 2²¹ = 21230110036061 is a prime.

It is a super-2 number, since 2×21230112133213² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230112133273) 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, 512670 + ... + 6536287.

It is an arithmetic number, because the mean of its divisors is an integer number (5307530548495).

Almost surely, 2^{21230112133213} is an apocalyptic number.

It is an amenable number.

21230112133213 is a deficient number, since it is larger than the sum of its proper divisors (10060767).

21230112133213 is an equidigital number, since it uses as much as digits as its factorization.

21230112133213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10060766.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 21230112133213 its reverse (31233121103212), we get a palindrome (52463233236425).

The spelling of 21230112133213 in words is "twenty-one trillion, two hundred thirty billion, one hundred twelve million, one hundred thirty-three thousand, two hundred thirteen".