21212111003 has 2 divisors, whose sum is σ = 21212111004. Its totient is φ = 21212111002.

The previous prime is 21212110963. The next prime is 21212111009. The reversal of 21212111003 is 30011121212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21212111003 - 2¹² = 21212106907 is a prime.

It is not a weakly prime, because it can be changed into another prime (21212111009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606055501 + 10606055502.

It is an arithmetic number, because the mean of its divisors is an integer number (10606055502).

Almost surely, 2^21212111003 is an apocalyptic number.

21212111003 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212111003 is an equidigital number, since it uses as much as digits as its factorization.

21212111003 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21212111003 its reverse (30011121212), we get a palindrome (51223232215).

The spelling of 21212111003 in words is "twenty-one billion, two hundred twelve million, one hundred eleven thousand, three".