21012121120112 has 10 divisors (see below), whose sum is σ = 40710984670248. Its totient is φ = 10506060560048.

The previous prime is 21012121120051. The next prime is 21012121120129. The reversal of 21012121120112 is 21102112121012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656628784988 + ... + 656628785019.

Almost surely, 2^{21012121120112} is an apocalyptic number.

It is an amenable number.

21012121120112 is a deficient number, since it is larger than the sum of its proper divisors (19698863550136).

21012121120112 is a wasteful number, since it uses less digits than its factorization.

21012121120112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1313257570015 (or 1313257570009 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21012121120112 its reverse (21102112121012), we get a palindrome (42114233241124).

The spelling of 21012121120112 in words is "twenty-one trillion, twelve billion, one hundred twenty-one million, one hundred twenty thousand, one hundred twelve".