21110010012 has 72 divisors (see below), whose sum is σ = 65675596896. Its totient is φ = 5567474304.

The previous prime is 21110010011. The next prime is 21110010109. The reversal of 21110010012 is 21001001112.

It is a happy number.

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 = 21110009976 and 21110010003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110010011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3218643 + ... + 3225194.

It is an arithmetic number, because the mean of its divisors is an integer number (912161068).

Almost surely, 2^21110010012 is an apocalyptic number.

It is an amenable number.

21110010012 is an abundant number, since it is smaller than the sum of its proper divisors (44565586884).

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

21110010012 is a wasteful number, since it uses less digits than its factorization.

21110010012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6443867 (or 6443862 counting only the distinct ones).

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

Adding to 21110010012 its reverse (21001001112), we get a palindrome (42111011124).

The spelling of 21110010012 in words is "twenty-one billion, one hundred ten million, ten thousand, twelve".