21011001121012 has 48 divisors (see below), whose sum is σ = 42769185822720. Its totient is φ = 8844853616352.

The previous prime is 21011001121007. The next prime is 21011001121013. The reversal of 21011001121012 is 21012110011012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21011001120983 and 21011001121001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011001121013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3179328 + ... + 7220119.

It is an arithmetic number, because the mean of its divisors is an integer number (891024704640).

Almost surely, 2^{21011001121012} is an apocalyptic number.

It is an amenable number.

21011001121012 is an abundant number, since it is smaller than the sum of its proper divisors (21758184701708).

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

21011001121012 is a wasteful number, since it uses less digits than its factorization.

21011001121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10400740 (or 10400738 counting only the distinct ones).

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

Adding to 21011001121012 its reverse (21012110011012), we get a palindrome (42023111132024).

Subtracting 21011001121012 from its reverse (21012110011012), we obtain a square (1108890000 = 33300²).

The spelling of 21011001121012 in words is "twenty-one trillion, eleven billion, one million, one hundred twenty-one thousand, twelve".