21202121121202 has 16 divisors (see below), whose sum is σ = 37191760638912. Its totient is φ = 8875306515600.

The previous prime is 21202121121193. The next prime is 21202121121221. The reversal of 21202121121202 is 20212112120212.

It is a self number, because there is not a number n which added to its sum of digits gives 21202121121202.

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, 17609734549 + ... + 17609735752.

It is an arithmetic number, because the mean of its divisors is an integer number (2324485039932).

Almost surely, 2^{21202121121202} is an apocalyptic number.

21202121121202 is a deficient number, since it is larger than the sum of its proper divisors (15989639517710).

21202121121202 is a wasteful number, since it uses less digits than its factorization.

21202121121202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35219470353.

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

Adding to 21202121121202 its reverse (20212112120212), we get a palindrome (41414233241414).

The spelling of 21202121121202 in words is "twenty-one trillion, two hundred two billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred two".