21202010002123 has 2 divisors, whose sum is σ = 21202010002124. Its totient is φ = 21202010002122.

The previous prime is 21202010002109. The next prime is 21202010002183. The reversal of 21202010002123 is 32120001020212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21202010002123 - 2²⁹ = 21201473131211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21202010002097 and 21202010002106.

It is not a weakly prime, because it can be changed into another prime (21202010002183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601005001061 + 10601005001062.

It is an arithmetic number, because the mean of its divisors is an integer number (10601005001062).

Almost surely, 2^{21202010002123} is an apocalyptic number.

21202010002123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202010002123 is an equidigital number, since it uses as much as digits as its factorization.

21202010002123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21202010002123 its reverse (32120001020212), we get a palindrome (53322011022335).

The spelling of 21202010002123 in words is "twenty-one trillion, two hundred two billion, ten million, two thousand, one hundred twenty-three".