21330213210 has 48 divisors (see below), whose sum is σ = 56748298464. Its totient is φ = 5555775456.

The previous prime is 21330213193. The next prime is 21330213239. The reversal of 21330213210 is 1231203312.

21330213210 is a `hidden beast` number, since 213 + 30 + 213 + 210 = 666.

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

It is a Curzon number.

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 23 ways as a sum of consecutive naturals, for example, 2751972 + ... + 2759711.

It is an arithmetic number, because the mean of its divisors is an integer number (1182256218).

Almost surely, 2^21330213210 is an apocalyptic number.

21330213210 is an abundant number, since it is smaller than the sum of its proper divisors (35418085254).

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

21330213210 is a wasteful number, since it uses less digits than its factorization.

21330213210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5511739 (or 5511736 counting only the distinct ones).

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

Adding to 21330213210 its reverse (1231203312), we get a palindrome (22561416522).

The spelling of 21330213210 in words is "twenty-one billion, three hundred thirty million, two hundred thirteen thousand, two hundred ten".