21212002289 has 2 divisors, whose sum is σ = 21212002290. Its totient is φ = 21212002288.

The previous prime is 21212002277. The next prime is 21212002303. The reversal of 21212002289 is 98220021212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21101920225 + 110082064 = 145265^2 + 10492^2 .

It is a cyclic number.

It is not a de Polignac number, because 21212002289 - 2⁸ = 21212002033 is a prime.

It is a super-2 number, since 2×21212002289² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21212002489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606001144 + 10606001145.

It is an arithmetic number, because the mean of its divisors is an integer number (10606001145).

Almost surely, 2^21212002289 is an apocalyptic number.

It is an amenable number.

21212002289 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212002289 is an equidigital number, since it uses as much as digits as its factorization.

21212002289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 29.

The spelling of 21212002289 in words is "twenty-one billion, two hundred twelve million, two thousand, two hundred eighty-nine".