21022113213 has 12 divisors (see below), whose sum is σ = 30462292380. Its totient is φ = 13969964736.

The previous prime is 21022113199. The next prime is 21022113239. The reversal of 21022113213 is 31231122012.

It can be written as a sum of positive squares in 2 ways, for example, as 569395044 + 20452718169 = 23862^2 + 143013^2 .

It is not a de Polignac number, because 21022113213 - 2⁴ = 21022113197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022113263) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3728478 + ... + 3734111.

It is an arithmetic number, because the mean of its divisors is an integer number (2538524365).

Almost surely, 2^21022113213 is an apocalyptic number.

It is an amenable number.

21022113213 is a deficient number, since it is larger than the sum of its proper divisors (9440179167).

21022113213 is a wasteful number, since it uses less digits than its factorization.

21022113213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7462908 (or 7462905 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21022113213 its reverse (31231122012), we get a palindrome (52253235225).

The spelling of 21022113213 in words is "twenty-one billion, twenty-two million, one hundred thirteen thousand, two hundred thirteen".