21213232113 has 16 divisors (see below), whose sum is σ = 28799366400. Its totient is φ = 13885220880.

The previous prime is 21213232093. The next prime is 21213232123. The reversal of 21213232113 is 31123231212.

It is not a de Polignac number, because 21213232113 - 2¹⁶ = 21213166577 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21213232113.

It is not an unprimeable number, because it can be changed into a prime (21213232123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69658 + ... + 217436.

It is an arithmetic number, because the mean of its divisors is an integer number (1799960400).

Almost surely, 2^21213232113 is an apocalyptic number.

It is an amenable number.

21213232113 is a deficient number, since it is larger than the sum of its proper divisors (7586134287).

21213232113 is a wasteful number, since it uses less digits than its factorization.

21213232113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148652.

The product of its digits is 432, while the sum is 21.

Adding to 21213232113 its reverse (31123231212), we get a palindrome (52336463325).

Subtracting 21213232113 from its reverse (31123231212), we obtain a palindrome (9909999099).

The spelling of 21213232113 in words is "twenty-one billion, two hundred thirteen million, two hundred thirty-two thousand, one hundred thirteen".