21231003330 has 24 divisors (see below), whose sum is σ = 55200608892. Its totient is φ = 5661600864.

The previous prime is 21231003329. The next prime is 21231003371. The reversal of 21231003330 is 3330013212.

21231003330 is a `hidden beast` number, since 21 + 2 + 310 + 0 + 3 + 330 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19136018889 + 2094984441 = 138333^2 + 45771^2 .

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 (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 117949929 + ... + 117950108.

Almost surely, 2^21231003330 is an apocalyptic number.

21231003330 is an abundant number, since it is smaller than the sum of its proper divisors (33969605562).

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

21231003330 is a wasteful number, since it uses less digits than its factorization.

21231003330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235900050 (or 235900047 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

Adding to 21231003330 its reverse (3330013212), we get a palindrome (24561016542).

The spelling of 21231003330 in words is "twenty-one billion, two hundred thirty-one million, three thousand, three hundred thirty".