21300312111 has 16 divisors (see below), whose sum is σ = 30825897984. Its totient is φ = 13004669664.

The previous prime is 21300312091. The next prime is 21300312119. The reversal of 21300312111 is 11121300312.

It is a happy number.

It is not a de Polignac number, because 21300312111 - 2³¹ = 19152828463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21300312119) 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, 2145291 + ... + 2155196.

It is an arithmetic number, because the mean of its divisors is an integer number (1926618624).

Almost surely, 2^21300312111 is an apocalyptic number.

21300312111 is a deficient number, since it is larger than the sum of its proper divisors (9525585873).

21300312111 is a wasteful number, since it uses less digits than its factorization.

21300312111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4300630.

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

Adding to 21300312111 its reverse (11121300312), we get a palindrome (32421612423).

It can be divided in two parts, 21300312 and 111, that multiplied together give a palindrome (2364334632).

The spelling of 21300312111 in words is "twenty-one billion, three hundred million, three hundred twelve thousand, one hundred eleven".