21221020200112 has 20 divisors (see below), whose sum is σ = 41184367268400. Its totient is φ = 10592796388928.

The previous prime is 21221020200101. The next prime is 21221020200131. The reversal of 21221020200112 is 21100202012212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

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, 1107097063 + ... + 1107116230.

It is an arithmetic number, because the mean of its divisors is an integer number (2059218363420).

Almost surely, 2^{21221020200112} is an apocalyptic number.

It is an amenable number.

21221020200112 is a deficient number, since it is larger than the sum of its proper divisors (19963347068288).

21221020200112 is a wasteful number, since it uses less digits than its factorization.

21221020200112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2214213900 (or 2214213894 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21221020200112 its reverse (21100202012212), we get a palindrome (42321222212324).

The spelling of 21221020200112 in words is "twenty-one trillion, two hundred twenty-one billion, twenty million, two hundred thousand, one hundred twelve".