21012110222122 has 4 divisors (see below), whose sum is σ = 31518165333186. Its totient is φ = 10506055111060.

The previous prime is 21012110222011. The next prime is 21012110222141. The reversal of 21012110222122 is 22122201121012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19736703645201 + 1275406576921 = 4442601^2 + 1129339^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21012110222122.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5253027555529 + ... + 5253027555532.

Almost surely, 2^{21012110222122} is an apocalyptic number.

21012110222122 is a deficient number, since it is larger than the sum of its proper divisors (10506055111064).

21012110222122 is a wasteful number, since it uses less digits than its factorization.

21012110222122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10506055111063.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21012110222122 its reverse (22122201121012), we get a palindrome (43134311343134).

The spelling of 21012110222122 in words is "twenty-one trillion, twelve billion, one hundred ten million, two hundred twenty-two thousand, one hundred twenty-two".