21133210112 has 80 divisors (see below), whose sum is σ = 48297712320. Its totient is φ = 9049509888.

The previous prime is 21133210099. The next prime is 21133210141. The reversal of 21133210112 is 21101233112.

It is a super-2 number, since 2×21133210112² (a number of 21 digits) contains 22 as substring.

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, 7263314 + ... + 7266222.

It is an arithmetic number, because the mean of its divisors is an integer number (603721404).

Almost surely, 2^21133210112 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 21133210112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24148856160).

21133210112 is an abundant number, since it is smaller than the sum of its proper divisors (27164502208).

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

21133210112 is an equidigital number, since it uses as much as digits as its factorization.

21133210112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4961 (or 4945 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21133210112 its reverse (21101233112), we get a palindrome (42234443224).

The spelling of 21133210112 in words is "twenty-one billion, one hundred thirty-three million, two hundred ten thousand, one hundred twelve".