21212222101002 has 48 divisors (see below), whose sum is σ = 48380497620000. Its totient is φ = 6698354774112.

The previous prime is 21212222100991. The next prime is 21212222101009. The reversal of 21212222101002 is 20010122221212.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (21212222101009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8494749 + ... + 10704447.

It is an arithmetic number, because the mean of its divisors is an integer number (1007927033750).

Almost surely, 2^{21212222101002} is an apocalyptic number.

21212222101002 is an abundant number, since it is smaller than the sum of its proper divisors (27168275518998).

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

21212222101002 is a wasteful number, since it uses less digits than its factorization.

21212222101002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2237795 (or 2237792 counting only the distinct ones).

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

Adding to 21212222101002 its reverse (20010122221212), we get a palindrome (41222344322214).

It can be divided in two parts, 2121222 and 2101002, that added together give a palindrome (4222224).

The spelling of 21212222101002 in words is "twenty-one trillion, two hundred twelve billion, two hundred twenty-two million, one hundred one thousand, two".