21210202002169 has 2 divisors, whose sum is σ = 21210202002170. Its totient is φ = 21210202002168.

The previous prime is 21210202002139. The next prime is 21210202002247. The reversal of 21210202002169 is 96120020201212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21138045297769 + 72156704400 = 4597613^2 + 268620^2 .

It is a cyclic number.

It is not a de Polignac number, because 21210202002169 - 2¹³ = 21210201993977 is a prime.

It is a super-2 number, since 2×21210202002169² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21210202002139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605101001084 + 10605101001085.

It is an arithmetic number, because the mean of its divisors is an integer number (10605101001085).

Almost surely, 2^{21210202002169} is an apocalyptic number.

It is an amenable number.

21210202002169 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210202002169 is an equidigital number, since it uses as much as digits as its factorization.

21210202002169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

The spelling of 21210202002169 in words is "twenty-one trillion, two hundred ten billion, two hundred two million, two thousand, one hundred sixty-nine".