21210333102 has 96 divisors (see below), whose sum is σ = 53993931264. Its totient is φ = 5890449600.

The previous prime is 21210333097. The next prime is 21210333143. The reversal of 21210333102 is 20133301212.

21210333102 is a `hidden beast` number, since 21 + 210 + 333 + 102 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7042777 + ... + 7045787.

It is an arithmetic number, because the mean of its divisors is an integer number (562436784).

Almost surely, 2^21210333102 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21210333102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26996965632).

21210333102 is an abundant number, since it is smaller than the sum of its proper divisors (32783598162).

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

21210333102 is a wasteful number, since it uses less digits than its factorization.

21210333102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4574 (or 4571 counting only the distinct ones).

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

Adding to 21210333102 its reverse (20133301212), we get a palindrome (41343634314).

The spelling of 21210333102 in words is "twenty-one billion, two hundred ten million, three hundred thirty-three thousand, one hundred two".