21011101021012 has 12 divisors (see below), whose sum is σ = 36817999350580. Its totient is φ = 10491672635136.

The previous prime is 21011101020941. The next prime is 21011101021037. The reversal of 21011101021012 is 21012010111012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4805758377616 + 16205342643396 = 2192204^2 + 4025586^2 .

It is a super-2 number, since 2×21011101021012² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21011101020983 and 21011101021001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3469465437 + ... + 3469471492.

Almost surely, 2^{21011101021012} is an apocalyptic number.

It is an amenable number.

21011101021012 is a deficient number, since it is larger than the sum of its proper divisors (15806898329568).

21011101021012 is a wasteful number, since it uses less digits than its factorization.

21011101021012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6938937690 (or 6938937688 counting only the distinct ones).

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

Adding to 21011101021012 its reverse (21012010111012), we get a palindrome (42023111132024).

The spelling of 21011101021012 in words is "twenty-one trillion, eleven billion, one hundred one million, twenty-one thousand, twelve".