21010001112 has 24 divisors (see below), whose sum is σ = 56902086540. Its totient is φ = 7003333680.

The previous prime is 21010001087. The next prime is 21010001119. The reversal of 21010001112 is 21110001012.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 21010001094 and 21010001103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010001119) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 145902714 + ... + 145902857.

Almost surely, 2^21010001112 is an apocalyptic number.

It is an amenable number.

21010001112 is an abundant number, since it is smaller than the sum of its proper divisors (35892085428).

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

21010001112 is a wasteful number, since it uses less digits than its factorization.

21010001112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291805583 (or 291805576 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 21010001112 its reverse (21110001012), we get a palindrome (42120002124).

The spelling of 21010001112 in words is "twenty-one billion, ten million, one thousand, one hundred twelve".