21112002212 has 72 divisors (see below), whose sum is σ = 43778599200. Its totient is φ = 8880955776.

The previous prime is 21112002193. The next prime is 21112002221. The reversal of 21112002212 is 21220021112.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2420363 + ... + 2429069.

It is an arithmetic number, because the mean of its divisors is an integer number (608036100).

Almost surely, 2^21112002212 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 21112002212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21889299600).

21112002212 is an abundant number, since it is smaller than the sum of its proper divisors (22666596988).

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

21112002212 is a wasteful number, since it uses less digits than its factorization.

21112002212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8953 (or 8944 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21112002212 its reverse (21220021112), we get a palindrome (42332023324).

The spelling of 21112002212 in words is "twenty-one billion, one hundred twelve million, two thousand, two hundred twelve".