21311330202 has 160 divisors (see below), whose sum is σ = 52646267520. Its totient is φ = 6413489280.

The previous prime is 21311330197. The next prime is 21311330213. The reversal of 21311330202 is 20203311312.

21311330202 is a `hidden beast` number, since 2 + 1 + 311 + 330 + 20 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

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 79 ways as a sum of consecutive naturals, for example, 32635708 + ... + 32636360.

It is an arithmetic number, because the mean of its divisors is an integer number (329039172).

Almost surely, 2^21311330202 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21311330202, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26323133760).

21311330202 is an abundant number, since it is smaller than the sum of its proper divisors (31334937318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21311330202 is a wasteful number, since it uses less digits than its factorization.

21311330202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1170 (or 1161 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21311330202 its reverse (20203311312), we get a palindrome (41514641514).

The spelling of 21311330202 in words is "twenty-one billion, three hundred eleven million, three hundred thirty thousand, two hundred two".