21101201112 has 64 divisors (see below), whose sum is σ = 53071238880. Its totient is φ = 6991373312.

The previous prime is 21101201111. The next prime is 21101201113. The reversal of 21101201112 is 21110210112.

It is an interprime number because it is at equal distance from previous prime (21101201111) and next prime (21101201113).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101201111) 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 15 ways as a sum of consecutive naturals, for example, 9043498 + ... + 9045830.

Almost surely, 2^21101201112 is an apocalyptic number.

It is an amenable number.

21101201112 is an abundant number, since it is smaller than the sum of its proper divisors (31970037768).

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

21101201112 is a wasteful number, since it uses less digits than its factorization.

21101201112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4452 (or 4448 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21101201112 its reverse (21110210112), we get a palindrome (42211411224).

The spelling of 21101201112 in words is "twenty-one billion, one hundred one million, two hundred one thousand, one hundred twelve".