21023110213 has 4 divisors (see below), whose sum is σ = 24026411680. Its totient is φ = 18019808748.

The previous prime is 21023110127. The next prime is 21023110243. The reversal of 21023110213 is 31201132012.

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 a de Polignac number, because none of the positive numbers 2^k-21023110213 is a prime.

It is a super-3 number, since 3×21023110213³ (a number of 32 digits) contains 333 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 (21023110243) 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, 1501650723 + ... + 1501650736.

It is an arithmetic number, because the mean of its divisors is an integer number (6006602920).

Almost surely, 2^21023110213 is an apocalyptic number.

It is an amenable number.

21023110213 is a deficient number, since it is larger than the sum of its proper divisors (3003301467).

21023110213 is an equidigital number, since it uses as much as digits as its factorization.

21023110213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3003301466.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21023110213 its reverse (31201132012), we get a palindrome (52224242225).

The spelling of 21023110213 in words is "twenty-one billion, twenty-three million, one hundred ten thousand, two hundred thirteen".