21121201122112 has 112 divisors (see below), whose sum is σ = 51725034350080. Its totient is φ = 8332871749632.

The previous prime is 21121201122097. The next prime is 21121201122247. The reversal of 21121201122112 is 21122110212112.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (112).

It is a super-2 number, since 2×21121201122112² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21121201122112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2803437 + ... + 7078252.

It is an arithmetic number, because the mean of its divisors is an integer number (461830663840).

Almost surely, 2^{21121201122112} is an apocalyptic number.

It is an amenable number.

21121201122112 is an abundant number, since it is smaller than the sum of its proper divisors (30603833227968).

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

21121201122112 is a wasteful number, since it uses less digits than its factorization.

21121201122112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9882088 (or 9882078 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21121201122112 its reverse (21122110212112), we get a palindrome (42243311334224).

The spelling of 21121201122112 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred one million, one hundred twenty-two thousand, one hundred twelve".