21220021003 has 2 divisors, whose sum is σ = 21220021004. Its totient is φ = 21220021002.

The previous prime is 21220021001. The next prime is 21220021033. The reversal of 21220021003 is 30012002212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21220021003 - 2¹ = 21220021001 is a prime.

It is a super-2 number, since 2×21220021003² (a number of 21 digits) contains 22 as substring.

Together with 21220021001, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21220021001) 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, 10610010501 + 10610010502.

It is an arithmetic number, because the mean of its divisors is an integer number (10610010502).

Almost surely, 2^21220021003 is an apocalyptic number.

21220021003 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220021003 is an equidigital number, since it uses as much as digits as its factorization.

21220021003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 21220021003 its reverse (30012002212), we get a palindrome (51232023215).

The spelling of 21220021003 in words is "twenty-one billion, two hundred twenty million, twenty-one thousand, three".