21311013330 has 40 divisors (see below), whose sum is σ = 57302949132. Its totient is φ = 5682936672.

The previous prime is 21311013329. The next prime is 21311013337. The reversal of 21311013330 is 3331011312.

It is a happy number.

21311013330 is a `hidden beast` number, since 21 + 311 + 0 + 1 + 3 + 330 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20676426849 + 634586481 = 143793^2 + 25191^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21311013337) 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 19 ways as a sum of consecutive naturals, for example, 13154137 + ... + 13155756.

Almost surely, 2^21311013330 is an apocalyptic number.

21311013330 is an abundant number, since it is smaller than the sum of its proper divisors (35991935802).

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

21311013330 is a wasteful number, since it uses less digits than its factorization.

21311013330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26309912 (or 26309903 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

Adding to 21311013330 its reverse (3331011312), we get a palindrome (24642024642).

The spelling of 21311013330 in words is "twenty-one billion, three hundred eleven million, thirteen thousand, three hundred thirty".