21204310122 has 48 divisors (see below), whose sum is σ = 46158547968. Its totient is φ = 7034973120.

The previous prime is 21204310117. The next prime is 21204310151. The reversal of 21204310122 is 22101340212.

It is a happy number.

21204310122 is a `hidden beast` number, since 212 + 0 + 431 + 0 + 1 + 22 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21204310095 and 21204310104.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3602622 + ... + 3608502.

It is an arithmetic number, because the mean of its divisors is an integer number (961636416).

Almost surely, 2^21204310122 is an apocalyptic number.

21204310122 is an abundant number, since it is smaller than the sum of its proper divisors (24954237846).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21204310122 is a wasteful number, since it uses less digits than its factorization.

21204310122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6795 (or 6792 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21204310122 its reverse (22101340212), we get a palindrome (43305650334).

The spelling of 21204310122 in words is "twenty-one billion, two hundred four million, three hundred ten thousand, one hundred twenty-two".