21221100110210 has 64 divisors (see below), whose sum is σ = 51286798612224. Its totient is φ = 6105571257600.

The previous prime is 21221100110207. The next prime is 21221100110239. The reversal of 21221100110210 is 1201100112212.

It is a Harshad number since it is a multiple of its sum of digits (14).

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 31 ways as a sum of consecutive naturals, for example, 1059985001 + ... + 1060005020.

It is an arithmetic number, because the mean of its divisors is an integer number (801356228316).

Almost surely, 2^{21221100110210} is an apocalyptic number.

21221100110210 is an abundant number, since it is smaller than the sum of its proper divisors (30065698502014).

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

21221100110210 is a wasteful number, since it uses less digits than its factorization.

21221100110210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2119990059.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21221100110210 its reverse (1201100112212), we get a palindrome (22422200222422).

The spelling of 21221100110210 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred million, one hundred ten thousand, two hundred ten".