21001012011112 has 32 divisors (see below), whose sum is σ = 46958784624000. Its totient is φ = 8609110513344.

The previous prime is 21001012011071. The next prime is 21001012011113. The reversal of 21001012011112 is 21111021010012.

It is a happy number.

It is a super-2 number, since 2×21001012011112² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21001012011092 and 21001012011101.

It is not an unprimeable number, because it can be changed into a prime (21001012011113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8152565487 + ... + 8152568062.

It is an arithmetic number, because the mean of its divisors is an integer number (1467462019500).

Almost surely, 2^{21001012011112} is an apocalyptic number.

It is an amenable number.

21001012011112 is an abundant number, since it is smaller than the sum of its proper divisors (25957772612888).

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

21001012011112 is a wasteful number, since it uses less digits than its factorization.

21001012011112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16305133585 (or 16305133581 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21001012011112 its reverse (21111021010012), we get a palindrome (42112033021124).

The spelling of 21001012011112 in words is "twenty-one trillion, one billion, twelve million, eleven thousand, one hundred twelve".