21222022104 has 96 divisors (see below), whose sum is σ = 57955154400. Its totient is φ = 7015288320.

The previous prime is 21222022093. The next prime is 21222022123. The reversal of 21222022104 is 40122022212.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5466244 + ... + 5470124.

It is an arithmetic number, because the mean of its divisors is an integer number (603699525).

Almost surely, 2^21222022104 is an apocalyptic number.

21222022104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21222022104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28977577200).

21222022104 is an abundant number, since it is smaller than the sum of its proper divisors (36733132296).

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

21222022104 is a wasteful number, since it uses less digits than its factorization.

21222022104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4505 (or 4498 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21222022104 its reverse (40122022212), we get a palindrome (61344044316).

The spelling of 21222022104 in words is "twenty-one billion, two hundred twenty-two million, twenty-two thousand, one hundred four".