21002221122 has 8 divisors (see below), whose sum is σ = 42004442256. Its totient is φ = 7000740372.

The previous prime is 21002221099. The next prime is 21002221133. The reversal of 21002221122 is 22112220012.

It is a sphenic number, since it is the product of 3 distinct primes.

21002221122 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1750185088 + ... + 1750185099.

It is an arithmetic number, because the mean of its divisors is an integer number (5250555282).

Almost surely, 2^21002221122 is an apocalyptic number.

21002221122 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21002221122 is a wasteful number, since it uses less digits than its factorization.

21002221122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3500370192.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21002221122 its reverse (22112220012), we get a palindrome (43114441134).

It can be divided in two parts, 2100 and 2221122, that added together give a palindrome (2223222).

The spelling of 21002221122 in words is "twenty-one billion, two million, two hundred twenty-one thousand, one hundred twenty-two".