21233331210 has 192 divisors, whose sum is σ = 64120896000. Its totient is φ = 4460295168.

The previous prime is 21233331209. The next prime is 21233331221. The reversal of 21233331210 is 1213333212.

It is a Harshad number since it is a multiple of its sum of digits (21).

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 95 ways as a sum of consecutive naturals, for example, 4564966 + ... + 4569614.

It is an arithmetic number, because the mean of its divisors is an integer number (333963000).

Almost surely, 2^21233331210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21233331210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32060448000).

21233331210 is an abundant number, since it is smaller than the sum of its proper divisors (42887564790).

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

21233331210 is a wasteful number, since it uses less digits than its factorization.

21233331210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4925 (or 4918 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21233331210 its reverse (1213333212), we get a palindrome (22446664422).

It can be divided in two parts, 2123 and 3331210, that added together give a palindrome (3333333).

The spelling of 21233331210 in words is "twenty-one billion, two hundred thirty-three million, three hundred thirty-one thousand, two hundred ten".