21223001013 has 4 divisors (see below), whose sum is σ = 28297334688. Its totient is φ = 14148667340.

The previous prime is 21223000999. The next prime is 21223001017. The reversal of 21223001013 is 31010032212.

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 21223001013 - 2⁶ = 21223000949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21223000983 and 21223001001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223001017) 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, 3537166833 + ... + 3537166838.

It is an arithmetic number, because the mean of its divisors is an integer number (7074333672).

Almost surely, 2^21223001013 is an apocalyptic number.

It is an amenable number.

21223001013 is a deficient number, since it is larger than the sum of its proper divisors (7074333675).

21223001013 is an equidigital number, since it uses as much as digits as its factorization.

21223001013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7074333674.

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

Adding to 21223001013 its reverse (31010032212), we get a palindrome (52233033225).

The spelling of 21223001013 in words is "twenty-one billion, two hundred twenty-three million, one thousand, thirteen".