21101011111012 has 12 divisors (see below), whose sum is σ = 42202022222080. Its totient is φ = 9043290476136.

The previous prime is 21101011111007. The next prime is 21101011111013. The reversal of 21101011111012 is 21011111010112.

21101011111012 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21101011110983 and 21101011111001.

It is not an unprimeable number, because it can be changed into a prime (21101011111013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 376803769812 + ... + 376803769867.

Almost surely, 2^{21101011111012} is an apocalyptic number.

It is an amenable number.

21101011111012 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21101011111012 is a wasteful number, since it uses less digits than its factorization.

21101011111012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753607539690 (or 753607539688 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 21101011111012 its reverse (21011111010112), we get a palindrome (42112122121124).

The spelling of 21101011111012 in words is "twenty-one trillion, one hundred one billion, eleven million, one hundred eleven thousand, twelve".