21020121020202 has 32 divisors (see below), whose sum is σ = 44386580958720. Its totient is φ = 6617878763760.

The previous prime is 21020121020191. The next prime is 21020121020231. The reversal of 21020121020202 is 20202012102012.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 278492518 + ... + 278567985.

It is an arithmetic number, because the mean of its divisors is an integer number (1387080654960).

Almost surely, 2^{21020121020202} is an apocalyptic number.

21020121020202 is an abundant number, since it is smaller than the sum of its proper divisors (23366459938518).

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

21020121020202 is a wasteful number, since it uses less digits than its factorization.

21020121020202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557060858.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21020121020202 its reverse (20202012102012), we get a palindrome (41222133122214).

The spelling of 21020121020202 in words is "twenty-one trillion, twenty billion, one hundred twenty-one million, twenty thousand, two hundred two".