21120010212 has 192 divisors, whose sum is σ = 59257110528. Its totient is φ = 5728320000.

The previous prime is 21120010201. The next prime is 21120010259. The reversal of 21120010212 is 21201002112.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 34453218 + ... + 34453830.

It is an arithmetic number, because the mean of its divisors is an integer number (308630784).

Almost surely, 2^21120010212 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 21120010212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29628555264).

21120010212 is an abundant number, since it is smaller than the sum of its proper divisors (38137100316).

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

21120010212 is a wasteful number, since it uses less digits than its factorization.

21120010212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890 (or 888 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21120010212 its reverse (21201002112), we get a palindrome (42321012324).

The spelling of 21120010212 in words is "twenty-one billion, one hundred twenty million, ten thousand, two hundred twelve".