21102310311 has 4 divisors (see below), whose sum is σ = 28136413752. Its totient is φ = 14068206872.

The previous prime is 21102310303. The next prime is 21102310321. The reversal of 21102310311 is 11301320112.

It is a happy number.

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 21102310311 - 2³ = 21102310303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102310321) 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, 3517051716 + ... + 3517051721.

It is an arithmetic number, because the mean of its divisors is an integer number (7034103438).

Almost surely, 2^21102310311 is an apocalyptic number.

21102310311 is a deficient number, since it is larger than the sum of its proper divisors (7034103441).

21102310311 is an equidigital number, since it uses as much as digits as its factorization.

21102310311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7034103440.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21102310311 its reverse (11301320112), we get a palindrome (32403630423).

The spelling of 21102310311 in words is "twenty-one billion, one hundred two million, three hundred ten thousand, three hundred eleven".