21122310223220 has 96 divisors (see below), whose sum is σ = 47536135113600. Its totient is φ = 7855427907584.

The previous prime is 21122310223199. The next prime is 21122310223243. The reversal of 21122310223220 is 2232201322112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 408853751 + ... + 408905409.

It is an arithmetic number, because the mean of its divisors is an integer number (495168074100).

Almost surely, 2^{21122310223220} is an apocalyptic number.

21122310223220 is a gapful number since it is divisible by the number (20) 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 21122310223220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23768067556800).

21122310223220 is an abundant number, since it is smaller than the sum of its proper divisors (26413824890380).

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

21122310223220 is a wasteful number, since it uses less digits than its factorization.

21122310223220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66257 (or 66255 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21122310223220 its reverse (2232201322112), we get a palindrome (23354511545332).

The spelling of 21122310223220 in words is "twenty-one trillion, one hundred twenty-two billion, three hundred ten million, two hundred twenty-three thousand, two hundred twenty".