21102211012 has 12 divisors (see below), whose sum is σ = 37034685100. Its totient is φ = 10520872416.

The previous prime is 21102211007. The next prime is 21102211019. The reversal of 21102211012 is 21011220112.

It can be written as a sum of positive squares in 2 ways, for example, as 15486806916 + 5615404096 = 124446^2 + 74936^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21102210983 and 21102211001.

It is not an unprimeable number, because it can be changed into a prime (21102211019) 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, 7556703 + ... + 7559494.

Almost surely, 2^21102211012 is an apocalyptic number.

It is an amenable number.

21102211012 is a deficient number, since it is larger than the sum of its proper divisors (15932474088).

21102211012 is a wasteful number, since it uses less digits than its factorization.

21102211012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15116550 (or 15116548 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21102211012 its reverse (21011220112), we get a palindrome (42113431124).

It can be divided in two parts, 2110 and 2211012, that added together give a palindrome (2213122).

The spelling of 21102211012 in words is "twenty-one billion, one hundred two million, two hundred eleven thousand, twelve".