21221313113 has 48 divisors (see below), whose sum is σ = 28781574528. Its totient is φ = 15225408000.

The previous prime is 21221313109. The next prime is 21221313133. The reversal of 21221313113 is 31131312212.

It is a happy number.

It is not a de Polignac number, because 21221313113 - 2² = 21221313109 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221313133) 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 47 ways as a sum of consecutive naturals, for example, 4765538 + ... + 4769988.

It is an arithmetic number, because the mean of its divisors is an integer number (599616136).

Almost surely, 2^21221313113 is an apocalyptic number.

It is an amenable number.

21221313113 is a deficient number, since it is larger than the sum of its proper divisors (7560261415).

21221313113 is a wasteful number, since it uses less digits than its factorization.

21221313113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4926 (or 4915 counting only the distinct ones).

The product of its digits is 216, while the sum is 20.

Adding to 21221313113 its reverse (31131312212), we get a palindrome (52352625325).

Subtracting 21221313113 from its reverse (31131312212), we obtain a palindrome (9909999099).

The spelling of 21221313113 in words is "twenty-one billion, two hundred twenty-one million, three hundred thirteen thousand, one hundred thirteen".