21212121283 has 2 divisors, whose sum is σ = 21212121284. Its totient is φ = 21212121282.

The previous prime is 21212121209. The next prime is 21212121299. The reversal of 21212121283 is 38212121212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21212121283 is a prime.

It is not a weakly prime, because it can be changed into another prime (21212121083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606060641 + 10606060642.

It is an arithmetic number, because the mean of its divisors is an integer number (10606060642).

Almost surely, 2^21212121283 is an apocalyptic number.

21212121283 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212121283 is an equidigital number, since it uses as much as digits as its factorization.

21212121283 is an evil number, because the sum of its binary digits is even.

The product of its digits is 768, while the sum is 25.

Adding to 21212121283 its reverse (38212121212), we get a palindrome (59424242495).

The spelling of 21212121283 in words is "twenty-one billion, two hundred twelve million, one hundred twenty-one thousand, two hundred eighty-three".