21103313211 has 40 divisors (see below), whose sum is σ = 32930244864. Its totient is φ = 13442909040.

The previous prime is 21103313197. The next prime is 21103313249. The reversal of 21103313211 is 11231330112.

21103313211 is a `hidden beast` number, since 2 + 1 + 10 + 331 + 321 + 1 = 666.

It is not a de Polignac number, because 21103313211 - 2¹⁰ = 21103312187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21103313111) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1915260 + ... + 1926246.

Almost surely, 2^21103313211 is an apocalyptic number.

21103313211 is a deficient number, since it is larger than the sum of its proper divisors (11826931653).

21103313211 is a wasteful number, since it uses less digits than its factorization.

21103313211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12053 (or 12044 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21103313211 its reverse (11231330112), we get a palindrome (32334643323).

The spelling of 21103313211 in words is "twenty-one billion, one hundred three million, three hundred thirteen thousand, two hundred eleven".