21102121220002 has 16 divisors (see below), whose sum is σ = 33041378649600. Its totient is φ = 10095976804320.

The previous prime is 21102121219939. The next prime is 21102121220009. The reversal of 21102121220002 is 20002212120112.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21102121220009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1912111302 + ... + 1912122337.

It is an arithmetic number, because the mean of its divisors is an integer number (2065086165600).

Almost surely, 2^{21102121220002} is an apocalyptic number.

21102121220002 is a deficient number, since it is larger than the sum of its proper divisors (11939257429598).

21102121220002 is a wasteful number, since it uses less digits than its factorization.

21102121220002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3824233761.

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

Adding to 21102121220002 its reverse (20002212120112), we get a palindrome (41104333340114).

The spelling of 21102121220002 in words is "twenty-one trillion, one hundred two billion, one hundred twenty-one million, two hundred twenty thousand, two".