21103202311 has 4 divisors (see below), whose sum is σ = 21134374632. Its totient is φ = 21072029992.

The previous prime is 21103202293. The next prime is 21103202333. The reversal of 21103202311 is 11320230112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21103202311 - 2¹¹ = 21103200263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103202371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15585145 + ... + 15586498.

It is an arithmetic number, because the mean of its divisors is an integer number (5283593658).

Almost surely, 2^21103202311 is an apocalyptic number.

21103202311 is a deficient number, since it is larger than the sum of its proper divisors (31172321).

21103202311 is an equidigital number, since it uses as much as digits as its factorization.

21103202311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31172320.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21103202311 its reverse (11320230112), we get a palindrome (32423432423).

The spelling of 21103202311 in words is "twenty-one billion, one hundred three million, two hundred two thousand, three hundred eleven".