21011222013 has 24 divisors (see below), whose sum is σ = 29480949600. Its totient is φ = 13295044896.

The previous prime is 21011221997. The next prime is 21011222047. The reversal of 21011222013 is 31022211012.

It is not a de Polignac number, because 21011222013 - 2⁴ = 21011221997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21011221983 and 21011222001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011222093) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 268158 + ... + 337536.

It is an arithmetic number, because the mean of its divisors is an integer number (1228372900).

Almost surely, 2^21011222013 is an apocalyptic number.

It is an amenable number.

21011222013 is a deficient number, since it is larger than the sum of its proper divisors (8469727587).

21011222013 is an equidigital number, since it uses as much as digits as its factorization.

21011222013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69529 (or 69470 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21011222013 its reverse (31022211012), we get a palindrome (52033433025).

The spelling of 21011222013 in words is "twenty-one billion, eleven million, two hundred twenty-two thousand, thirteen".