21001111110012 has 24 divisors (see below), whose sum is σ = 53457373734912. Its totient is φ = 6363973063600.

The previous prime is 21001111109987. The next prime is 21001111110059.

21001111110012 is nontrivially palindromic in base 10.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21001111110012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79549663164 + ... + 79549663427.

It is an arithmetic number, because the mean of its divisors is an integer number (2227390572288).

Almost surely, 2^{21001111110012} is an apocalyptic number.

21001111110012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21001111110012 is an abundant number, since it is smaller than the sum of its proper divisors (32456262624900).

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

21001111110012 is a wasteful number, since it uses less digits than its factorization.

21001111110012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159099326609 (or 159099326607 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 12.

It can be divided in two parts, 2100111 and 1110012, that multiplied together give a palindrome (2331148411332).

The spelling of 21001111110012 in words is "twenty-one trillion, one billion, one hundred eleven million, one hundred ten thousand, twelve".