21212202119989 has 2 divisors, whose sum is σ = 21212202119990. Its totient is φ = 21212202119988.

The previous prime is 21212202119971. The next prime is 21212202120001. The reversal of 21212202119989 is 98991120221212.

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., 20388990683889 + 823211436100 = 4515417^2 + 907310^2 .

It is a cyclic number.

It is not a de Polignac number, because 21212202119989 - 2¹³ = 21212202111797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21212202119909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606101059994 + 10606101059995.

It is an arithmetic number, because the mean of its divisors is an integer number (10606101059995).

Almost surely, 2^{21212202119989} is an apocalyptic number.

It is an amenable number.

21212202119989 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212202119989 is an equidigital number, since it uses as much as digits as its factorization.

21212202119989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 49.

The spelling of 21212202119989 in words is "twenty-one trillion, two hundred twelve billion, two hundred two million, one hundred nineteen thousand, nine hundred eighty-nine".