21103320411 has 12 divisors (see below), whose sum is σ = 30701874840. Its totient is φ = 13967664480.

The previous prime is 21103320383. The next prime is 21103320449. The reversal of 21103320411 is 11402330112.

It is not a de Polignac number, because 21103320411 - 2¹⁷ = 21103189339 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21103320611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8433330 + ... + 8435831.

It is an arithmetic number, because the mean of its divisors is an integer number (2558489570).

Almost surely, 2^21103320411 is an apocalyptic number.

21103320411 is a deficient number, since it is larger than the sum of its proper divisors (9598554429).

21103320411 is a wasteful number, since it uses less digits than its factorization.

21103320411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16869306 (or 16869303 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21103320411 its reverse (11402330112), we get a palindrome (32505650523).

The spelling of 21103320411 in words is "twenty-one billion, one hundred three million, three hundred twenty thousand, four hundred eleven".