21202010002109 has 2 divisors, whose sum is σ = 21202010002110. Its totient is φ = 21202010002108.

The previous prime is 21202010002081. The next prime is 21202010002123. The reversal of 21202010002109 is 90120001020212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16626389537209 + 4575620464900 = 4077547^2 + 2139070^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202010002109 - 2⁸ = 21202010001853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21202010002189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601005001054 + 10601005001055.

It is an arithmetic number, because the mean of its divisors is an integer number (10601005001055).

Almost surely, 2^{21202010002109} is an apocalyptic number.

It is an amenable number.

21202010002109 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202010002109 is an equidigital number, since it uses as much as digits as its factorization.

21202010002109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 21202010002109 in words is "twenty-one trillion, two hundred two billion, ten million, two thousand, one hundred nine".