21111300111 has 32 divisors (see below), whose sum is σ = 33562515456. Its totient is φ = 11653632000.

The previous prime is 21111300109. The next prime is 21111300131. The reversal of 21111300111 is 11100311112.

It is not a de Polignac number, because 21111300111 - 2¹ = 21111300109 is a prime.

It is a super-2 number, since 2×21111300111² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111300131) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 589570 + ... + 624351.

It is an arithmetic number, because the mean of its divisors is an integer number (1048828608).

Almost surely, 2^21111300111 is an apocalyptic number.

21111300111 is a deficient number, since it is larger than the sum of its proper divisors (12451215345).

21111300111 is a wasteful number, since it uses less digits than its factorization.

21111300111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1213983.

The product of its (nonzero) digits is 6, while the sum is 12.

Adding to 21111300111 its reverse (11100311112), we get a palindrome (32211611223).

The spelling of 21111300111 in words is "twenty-one billion, one hundred eleven million, three hundred thousand, one hundred eleven".