21100233322212 has 144 divisors (see below), whose sum is σ = 55588886484096. Its totient is φ = 6220113292800.

The previous prime is 21100233322211. The next prime is 21100233322219. The reversal of 21100233322212 is 21222333200112.

It is a super-2 number, since 2×21100233322212² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21100233322211) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 339021048 + ... + 339083280.

Almost surely, 2^{21100233322212} is an apocalyptic number.

21100233322212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21100233322212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27794443242048).

21100233322212 is an abundant number, since it is smaller than the sum of its proper divisors (34488653161884).

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

21100233322212 is a wasteful number, since it uses less digits than its factorization.

21100233322212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68610 (or 68597 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21100233322212 its reverse (21222333200112), we get a palindrome (42322566522324).

The spelling of 21100233322212 in words is "twenty-one trillion, one hundred billion, two hundred thirty-three million, three hundred twenty-two thousand, two hundred twelve".