21100211210 has 64 divisors (see below), whose sum is σ = 42535342080. Its totient is φ = 7482558720.

The previous prime is 21100211191. The next prime is 21100211219. The reversal of 21100211210 is 1211200112.

It is a junction number, because it is equal to n+sod(n) for n = 21100211191 and 21100211200.

It is not an unprimeable number, because it can be changed into a prime (21100211219) 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 31 ways as a sum of consecutive naturals, for example, 705419 + ... + 734721.

It is an arithmetic number, because the mean of its divisors is an integer number (664614720).

Almost surely, 2^21100211210 is an apocalyptic number.

21100211210 is an abundant number, since it is smaller than the sum of its proper divisors (21435130870).

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

21100211210 is a wasteful number, since it uses less digits than its factorization.

21100211210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29543.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21100211210 its reverse (1211200112), we get a palindrome (22311411322).

The spelling of 21100211210 in words is "twenty-one billion, one hundred million, two hundred eleven thousand, two hundred ten".