21234021112 has 16 divisors (see below), whose sum is σ = 39816528840. Its totient is φ = 10616280096.

The previous prime is 21234021077. The next prime is 21234021119. The reversal of 21234021112 is 21112043212.

It is a self number, because there is not a number n which added to its sum of digits gives 21234021112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234021119) 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 3 ways as a sum of consecutive naturals, for example, 44038 + ... + 210730.

Almost surely, 2^21234021112 is an apocalyptic number.

It is an amenable number.

21234021112 is a deficient number, since it is larger than the sum of its proper divisors (18582507728).

21234021112 is a wasteful number, since it uses less digits than its factorization.

21234021112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182622 (or 182618 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21234021112 its reverse (21112043212), we get a palindrome (42346064324).

The spelling of 21234021112 in words is "twenty-one billion, two hundred thirty-four million, twenty-one thousand, one hundred twelve".