21002221010122 has 16 divisors (see below), whose sum is σ = 34367805900000. Its totient is φ = 9546315441040.

The previous prime is 21002221010087. The next prime is 21002221010149. The reversal of 21002221010122 is 22101012220012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21002221010096 and 21002221010105.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5981497 + ... + 8819452.

It is an arithmetic number, because the mean of its divisors is an integer number (2147987868750).

Almost surely, 2^{21002221010122} is an apocalyptic number.

21002221010122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21002221010122 is a deficient number, since it is larger than the sum of its proper divisors (13365584889878).

21002221010122 is a wasteful number, since it uses less digits than its factorization.

21002221010122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14865461.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21002221010122 its reverse (22101012220012), we get a palindrome (43103233230134).

The spelling of 21002221010122 in words is "twenty-one trillion, two billion, two hundred twenty-one million, ten thousand, one hundred twenty-two".