21202002220122 has 32 divisors (see below), whose sum is σ = 47115793056000. Its totient is φ = 7067299188384.

The previous prime is 21202002220093. The next prime is 21202002220171. The reversal of 21202002220122 is 22102220020212.

21202002220122 is a `hidden beast` number, since 2 + 120 + 200 + 2 + 220 + 122 = 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 = 21202002220095 and 21202002220104.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11557743 + ... + 13265949.

It is an arithmetic number, because the mean of its divisors is an integer number (1472368533000).

Almost surely, 2^{21202002220122} is an apocalyptic number.

21202002220122 is an abundant number, since it is smaller than the sum of its proper divisors (25913790835878).

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

21202002220122 is a wasteful number, since it uses less digits than its factorization.

21202002220122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1938067 (or 1938061 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21202002220122 its reverse (22102220020212), we get a palindrome (43304222240334).

The spelling of 21202002220122 in words is "twenty-one trillion, two hundred two billion, two million, two hundred twenty thousand, one hundred twenty-two".