21220310112 has 192 divisors, whose sum is σ = 60852363264. Its totient is φ = 6448619520.

The previous prime is 21220310101. The next prime is 21220310131. The reversal of 21220310112 is 21101302212.

It is a super-2 number, since 2×21220310112² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21220310091 and 21220310100.

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, 8911162 + ... + 8913542.

It is an arithmetic number, because the mean of its divisors is an integer number (316939392).

Almost surely, 2^21220310112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21220310112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30426181632).

21220310112 is an abundant number, since it is smaller than the sum of its proper divisors (39632053152).

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

21220310112 is a wasteful number, since it uses less digits than its factorization.

21220310112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2581 (or 2573 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21220310112 its reverse (21101302212), we get a palindrome (42321612324).

The spelling of 21220310112 in words is "twenty-one billion, two hundred twenty million, three hundred ten thousand, one hundred twelve".