21212223122310 has 384 divisors, whose sum is σ = 59386521600000. Its totient is φ = 4836912537600.

The previous prime is 21212223122287. The next prime is 21212223122353. The reversal of 21212223122310 is 1322132221212.

It is a super-2 number, since 2×21212223122310² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 5200346851 + ... + 5200350929.

It is an arithmetic number, because the mean of its divisors is an integer number (154652400000).

Almost surely, 2^{21212223122310} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21212223122310, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29693260800000).

21212223122310 is an abundant number, since it is smaller than the sum of its proper divisors (38174298477690).

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

21212223122310 is a wasteful number, since it uses less digits than its factorization.

21212223122310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5428 (or 5417 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21212223122310 its reverse (1322132221212), we get a palindrome (22534355343522).

The spelling of 21212223122310 in words is "twenty-one trillion, two hundred twelve billion, two hundred twenty-three million, one hundred twenty-two thousand, three hundred ten".