21003324413 has 16 divisors (see below), whose sum is σ = 22460705280. Its totient is φ = 19583517744.

The previous prime is 21003324403. The next prime is 21003324427. The reversal of 21003324413 is 31442330012.

It is a cyclic number.

It is not a de Polignac number, because 21003324413 - 2¹⁰ = 21003323389 is a prime.

It is a super-2 number, since 2×21003324413² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003324403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 286070 + ... + 351912.

It is an arithmetic number, because the mean of its divisors is an integer number (1403794080).

Almost surely, 2^21003324413 is an apocalyptic number.

It is an amenable number.

21003324413 is a deficient number, since it is larger than the sum of its proper divisors (1457380867).

21003324413 is a wasteful number, since it uses less digits than its factorization.

21003324413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66128.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21003324413 its reverse (31442330012), we get a palindrome (52445654425).

The spelling of 21003324413 in words is "twenty-one billion, three million, three hundred twenty-four thousand, four hundred thirteen".