21122310220 has 24 divisors (see below), whose sum is σ = 48389293008. Its totient is φ = 7680840000.

The previous prime is 21122310197. The next prime is 21122310233. The reversal of 21122310220 is 2201322112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21122310194 and 21122310203.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48005031 + ... + 48005470.

It is an arithmetic number, because the mean of its divisors is an integer number (2016220542).

Almost surely, 2^21122310220 is an apocalyptic number.

21122310220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122310220 is an abundant number, since it is smaller than the sum of its proper divisors (27266982788).

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

21122310220 is a wasteful number, since it uses less digits than its factorization.

21122310220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96010521 (or 96010519 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21122310220 its reverse (2201322112), we get a palindrome (23323632332).

The spelling of 21122310220 in words is "twenty-one billion, one hundred twenty-two million, three hundred ten thousand, two hundred twenty".