21221333113 has 4 divisors (see below), whose sum is σ = 21229634980. Its totient is φ = 21213031248.

The previous prime is 21221333101. The next prime is 21221333129. The reversal of 21221333113 is 31133312212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13035245584 + 8186087529 = 114172^2 + 90477^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21221333113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221333143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4147098 + ... + 4152211.

It is an arithmetic number, because the mean of its divisors is an integer number (5307408745).

Almost surely, 2^21221333113 is an apocalyptic number.

It is an amenable number.

21221333113 is a deficient number, since it is larger than the sum of its proper divisors (8301867).

21221333113 is an equidigital number, since it uses as much as digits as its factorization.

21221333113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8301866.

The product of its digits is 648, while the sum is 22.

Adding to 21221333113 its reverse (31133312212), we get a palindrome (52354645325).

The spelling of 21221333113 in words is "twenty-one billion, two hundred twenty-one million, three hundred thirty-three thousand, one hundred thirteen".