21202122202122 has 16 divisors (see below), whose sum is σ = 42406466262912. Its totient is φ = 7067003757600.

The previous prime is 21202122202111. The next prime is 21202122202141. The reversal of 21202122202122 is 22120222120212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92453379 + ... + 92682422.

It is an arithmetic number, because the mean of its divisors is an integer number (2650404141432).

Almost surely, 2^{21202122202122} is an apocalyptic number.

21202122202122 is an abundant number, since it is smaller than the sum of its proper divisors (21204344060790).

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

21202122202122 is a wasteful number, since it uses less digits than its factorization.

21202122202122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185154893.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21202122202122 its reverse (22120222120212), we get a palindrome (43322344322334).

The spelling of 21202122202122 in words is "twenty-one trillion, two hundred two billion, one hundred twenty-two million, two hundred two thousand, one hundred twenty-two".