21221303133 has 16 divisors (see below), whose sum is σ = 30320450496. Its totient is φ = 13154899200.

The previous prime is 21221303123. The next prime is 21221303143. The reversal of 21221303133 is 33130312212.

It is an interprime number because it is at equal distance from previous prime (21221303123) and next prime (21221303143).

It is a de Polignac number, because none of the positive numbers 2^k-21221303133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221303123) 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 15 ways as a sum of consecutive naturals, for example, 2502418 + ... + 2510883.

It is an arithmetic number, because the mean of its divisors is an integer number (1895028156).

Almost surely, 2^21221303133 is an apocalyptic number.

It is an amenable number.

21221303133 is a deficient number, since it is larger than the sum of its proper divisors (9099147363).

21221303133 is a wasteful number, since it uses less digits than its factorization.

21221303133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5013404.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21221303133 its reverse (33130312212), we get a palindrome (54351615345).

The spelling of 21221303133 in words is "twenty-one billion, two hundred twenty-one million, three hundred three thousand, one hundred thirty-three".