21111012230 has 32 divisors (see below), whose sum is σ = 47376403200. Its totient is φ = 6580055520.

The previous prime is 21111012203. The next prime is 21111012259. The reversal of 21111012230 is 3221011112.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13707680 + ... + 13709219.

It is an arithmetic number, because the mean of its divisors is an integer number (1480512600).

Almost surely, 2^21111012230 is an apocalyptic number.

21111012230 is an abundant number, since it is smaller than the sum of its proper divisors (26265390970).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21111012230 is a wasteful number, since it uses less digits than its factorization.

21111012230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27416924.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21111012230 its reverse (3221011112), we get a palindrome (24332023342).

The spelling of 21111012230 in words is "twenty-one billion, one hundred eleven million, twelve thousand, two hundred thirty".