21220210110 has 128 divisors (see below), whose sum is σ = 56308193280. Its totient is φ = 5075302400.

The previous prime is 21220210087. The next prime is 21220210133. The reversal of 21220210110 is 1101202212.

It is an interprime number because it is at equal distance from previous prime (21220210087) and next prime (21220210133).

It is a super-2 number, since 2×21220210110² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8911120 + ... + 8913500.

It is an arithmetic number, because the mean of its divisors is an integer number (439907760).

Almost surely, 2^21220210110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21220210110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28154096640).

21220210110 is an abundant number, since it is smaller than the sum of its proper divisors (35087983170).

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

21220210110 is a wasteful number, since it uses less digits than its factorization.

21220210110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2754.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21220210110 its reverse (1101202212), we get a palindrome (22321412322).

The spelling of 21220210110 in words is "twenty-one billion, two hundred twenty million, two hundred ten thousand, one hundred ten".