21003213330 has 80 divisors (see below), whose sum is σ = 61609451904. Its totient is φ = 5091685920.

The previous prime is 21003213317. The next prime is 21003213331. The reversal of 21003213330 is 3331230012.

21003213330 is a `hidden beast` number, since 2 + 10 + 0 + 321 + 3 + 330 = 666.

It is a super-2 number, since 2×21003213330² (a number of 21 digits) contains 22 as substring.

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 (21003213331) 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 39 ways as a sum of consecutive naturals, for example, 1169722 + ... + 1187541.

Almost surely, 2^21003213330 is an apocalyptic number.

21003213330 is an abundant number, since it is smaller than the sum of its proper divisors (40606238574).

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

21003213330 is a wasteful number, since it uses less digits than its factorization.

21003213330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2357293 (or 2357284 counting only the distinct ones).

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

Adding to 21003213330 its reverse (3331230012), we get a palindrome (24334443342).

The spelling of 21003213330 in words is "twenty-one billion, three million, two hundred thirteen thousand, three hundred thirty".