21112222012002 has 192 divisors, whose sum is σ = 53767429447680. Its totient is φ = 5920268428800.

The previous prime is 21112222011997. The next prime is 21112222012027. The reversal of 21112222012002 is 20021022221112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 499593658 + ... + 499635914.

It is an arithmetic number, because the mean of its divisors is an integer number (280038695040).

Almost surely, 2^{21112222012002} is an apocalyptic number.

21112222012002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21112222012002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26883714723840).

21112222012002 is an abundant number, since it is smaller than the sum of its proper divisors (32655207435678).

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

21112222012002 is a wasteful number, since it uses less digits than its factorization.

21112222012002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45869 (or 45866 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21112222012002 its reverse (20021022221112), we get a palindrome (41133244233114).

The spelling of 21112222012002 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty-two million, twelve thousand, two".