21012212220112 has 160 divisors (see below), whose sum is σ = 43799754564864. Its totient is φ = 9730575360000.

The previous prime is 21012212220107. The next prime is 21012212220157. The reversal of 21012212220112 is 21102221221012.

It is a super-3 number, since 3×21012212220112³ (a number of 41 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21012212220112.

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, 2122226362 + ... + 2122236262.

Almost surely, 2^{21012212220112} 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 21012212220112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21899877282432).

21012212220112 is an abundant number, since it is smaller than the sum of its proper divisors (22787542344752).

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

21012212220112 is a wasteful number, since it uses less digits than its factorization.

21012212220112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10557 (or 10551 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21012212220112 its reverse (21102221221012), we get a palindrome (42114433441124).

The spelling of 21012212220112 in words is "twenty-one trillion, twelve billion, two hundred twelve million, two hundred twenty thousand, one hundred twelve".