21240213003 has 6 divisors (see below), whose sum is σ = 30680307684. Its totient is φ = 14160141996.

The previous prime is 21240212989. The next prime is 21240213011. The reversal of 21240213003 is 30031204212.

It is not a de Polignac number, because 21240213003 - 2⁵ = 21240212971 is a prime.

It is a super-2 number, since 2×21240213003² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21240213013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1180011825 + ... + 1180011842.

It is an arithmetic number, because the mean of its divisors is an integer number (5113384614).

Almost surely, 2^21240213003 is an apocalyptic number.

21240213003 is a deficient number, since it is larger than the sum of its proper divisors (9440094681).

21240213003 is a wasteful number, since it uses less digits than its factorization.

21240213003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2360023673 (or 2360023670 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21240213003 its reverse (30031204212), we get a palindrome (51271417215).

The spelling of 21240213003 in words is "twenty-one billion, two hundred forty million, two hundred thirteen thousand, three".