21213122003 has 2 divisors, whose sum is σ = 21213122004. Its totient is φ = 21213122002.

The previous prime is 21213121991. The next prime is 21213122027. The reversal of 21213122003 is 30022131212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21213122003 - 2¹⁸ = 21212859859 is a prime.

It is a super-2 number, since 2×21213122003² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21213122303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606561001 + 10606561002.

It is an arithmetic number, because the mean of its divisors is an integer number (10606561002).

Almost surely, 2^21213122003 is an apocalyptic number.

21213122003 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213122003 is an equidigital number, since it uses as much as digits as its factorization.

21213122003 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21213122003 its reverse (30022131212), we get a palindrome (51235253215).

The spelling of 21213122003 in words is "twenty-one billion, two hundred thirteen million, one hundred twenty-two thousand, three".