21111311230 has 16 divisors (see below), whose sum is σ = 38927199024. Its totient is φ = 8238560320.

The previous prime is 21111311227. The next prime is 21111311239. The reversal of 21111311230 is 3211311112.

It is a happy number.

It is a super-2 number, since 2×21111311230² (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 (21111311239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25745092 + ... + 25745911.

It is an arithmetic number, because the mean of its divisors is an integer number (2432949939).

Almost surely, 2^21111311230 is an apocalyptic number.

21111311230 is a deficient number, since it is larger than the sum of its proper divisors (17815887794).

21111311230 is a wasteful number, since it uses less digits than its factorization.

21111311230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51491051.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21111311230 its reverse (3211311112), we get a palindrome (24322622342).

The spelling of 21111311230 in words is "twenty-one billion, one hundred eleven million, three hundred eleven thousand, two hundred thirty".