21211021003 has 2 divisors, whose sum is σ = 21211021004. Its totient is φ = 21211021002.

The previous prime is 21211020977. The next prime is 21211021081. The reversal of 21211021003 is 30012011212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21211021003 - 2¹³ = 21211012811 is a prime.

It is not a weakly prime, because it can be changed into another prime (21211121003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605510501 + 10605510502.

It is an arithmetic number, because the mean of its divisors is an integer number (10605510502).

Almost surely, 2^21211021003 is an apocalyptic number.

21211021003 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211021003 is an equidigital number, since it uses as much as digits as its factorization.

21211021003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21211021003 its reverse (30012011212), we get a palindrome (51223032215).

The spelling of 21211021003 in words is "twenty-one billion, two hundred eleven million, twenty-one thousand, three".