21100100210 has 192 divisors, whose sum is σ = 47709492480. Its totient is φ = 6678927360.

The previous prime is 21100100179. The next prime is 21100100221. The reversal of 21100100210 is 1200100112.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 90558254 + ... + 90558486.

It is an arithmetic number, because the mean of its divisors is an integer number (248486940).

Almost surely, 2^21100100210 is an apocalyptic number.

21100100210 is an abundant number, since it is smaller than the sum of its proper divisors (26609392270).

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

21100100210 is a wasteful number, since it uses less digits than its factorization.

21100100210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481 (or 474 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 21100100210 its reverse (1200100112), we get a palindrome (22300200322).

The spelling of 21100100210 in words is "twenty-one billion, one hundred million, one hundred thousand, two hundred ten".