21211222020112 has 20 divisors (see below), whose sum is σ = 41096974961196. Its totient is φ = 10605551062400.

The previous prime is 21211222020077. The next prime is 21211222020143. The reversal of 21211222020112 is 21102022211212.

It can be written as a sum of positive squares in 2 ways, for example, as 20894370113296 + 316851906816 = 4571036^2 + 562896^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21211222020112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 755263 + ... + 6556894.

Almost surely, 2^{21211222020112} is an apocalyptic number.

It is an amenable number.

21211222020112 is a deficient number, since it is larger than the sum of its proper divisors (19885752941084).

21211222020112 is a wasteful number, since it uses less digits than its factorization.

21211222020112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7493466 (or 7493460 counting only the distinct ones).

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

Adding to 21211222020112 its reverse (21102022211212), we get a palindrome (42313244231324).

The spelling of 21211222020112 in words is "twenty-one trillion, two hundred eleven billion, two hundred twenty-two million, twenty thousand, one hundred twelve".