21111101220112 has 40 divisors (see below), whose sum is σ = 43599466431000. Its totient is φ = 9867960440832.

The previous prime is 21111101220109. The next prime is 21111101220149. The reversal of 21111101220112 is 21102210111112.

It can be written as a sum of positive squares in 4 ways, for example, as 5818496568336 + 15292604651776 = 2412156^2 + 3910576^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

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, 260410287 + ... + 260491342.

It is an arithmetic number, because the mean of its divisors is an integer number (1089986660775).

Almost surely, 2^{21111101220112} is an apocalyptic number.

It is an amenable number.

21111101220112 is an abundant number, since it is smaller than the sum of its proper divisors (22488365210888).

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

21111101220112 is a wasteful number, since it uses less digits than its factorization.

21111101220112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520901803 (or 520901797 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 21111101220112 its reverse (21102210111112), we get a palindrome (42213311331224).

The spelling of 21111101220112 in words is "twenty-one trillion, one hundred eleven billion, one hundred one million, two hundred twenty thousand, one hundred twelve".