21221101210110 has 64 divisors (see below), whose sum is σ = 53940106379520. Its totient is φ = 5328229973760.

The previous prime is 21221101210061. The next prime is 21221101210117. The reversal of 21221101210110 is 1101210112212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21221101210110.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221101210117) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 114109551 + ... + 114295370.

It is an arithmetic number, because the mean of its divisors is an integer number (842814162180).

Almost surely, 2^{21221101210110} is an apocalyptic number.

21221101210110 is an abundant number, since it is smaller than the sum of its proper divisors (32719005169410).

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

21221101210110 is a wasteful number, since it uses less digits than its factorization.

21221101210110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228405113.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21221101210110 its reverse (1101210112212), we get a palindrome (22322311322322).

The spelling of 21221101210110 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred one million, two hundred ten thousand, one hundred ten".