21102202010021 has 16 divisors (see below), whose sum is σ = 23028537139008. Its totient is φ = 19177193664000.

The previous prime is 21102202010017. The next prime is 21102202010059. The reversal of 21102202010021 is 12001020220112.

It is a cyclic number.

It is not a de Polignac number, because 21102202010021 - 2² = 21102202010017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21102202009978 and 21102202010005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102202010921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 415593191 + ... + 415643963.

It is an arithmetic number, because the mean of its divisors is an integer number (1439283571188).

Almost surely, 2^{21102202010021} is an apocalyptic number.

It is an amenable number.

21102202010021 is a deficient number, since it is larger than the sum of its proper divisors (1926335128987).

21102202010021 is a wasteful number, since it uses less digits than its factorization.

21102202010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63092.

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

Adding to 21102202010021 its reverse (12001020220112), we get a palindrome (33103222230133).

The spelling of 21102202010021 in words is "twenty-one trillion, one hundred two billion, two hundred two million, ten thousand, twenty-one".