21212121083 has 2 divisors, whose sum is σ = 21212121084. Its totient is φ = 21212121082.

The previous prime is 21212121061. The next prime is 21212121107. The reversal of 21212121083 is 38012121212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21212121083 - 2²⁰ = 21211072507 is a prime.

It is a super-3 number, since 3×21212121083³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21212121023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606060541 + 10606060542.

It is an arithmetic number, because the mean of its divisors is an integer number (10606060542).

Almost surely, 2^21212121083 is an apocalyptic number.

21212121083 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212121083 is an equidigital number, since it uses as much as digits as its factorization.

21212121083 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 23.

Adding to 21212121083 its reverse (38012121212), we get a palindrome (59224242295).

The spelling of 21212121083 in words is "twenty-one billion, two hundred twelve million, one hundred twenty-one thousand, eighty-three".