21221332113 has 16 divisors (see below), whose sum is σ = 28355696000. Its totient is φ = 14117293440.

The previous prime is 21221332109. The next prime is 21221332133. The reversal of 21221332113 is 31123312212.

It is not a de Polignac number, because 21221332113 - 2² = 21221332109 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21221332113.

It is not an unprimeable number, because it can be changed into a prime (21221332133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3891813 + ... + 3897261.

It is an arithmetic number, because the mean of its divisors is an integer number (1772231000).

Almost surely, 2^21221332113 is an apocalyptic number.

It is an amenable number.

21221332113 is a deficient number, since it is larger than the sum of its proper divisors (7134363887).

21221332113 is a wasteful number, since it uses less digits than its factorization.

21221332113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7992.

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

Adding to 21221332113 its reverse (31123312212), we get a palindrome (52344644325).

The spelling of 21221332113 in words is "twenty-one billion, two hundred twenty-one million, three hundred thirty-two thousand, one hundred thirteen".