21201021210202 has 32 divisors (see below), whose sum is σ = 32020190377344. Its totient is φ = 10527932620800.

The previous prime is 21201021210167. The next prime is 21201021210221. The reversal of 21201021210202 is 20201212010212.

It is a happy number.

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, 206021802 + ... + 206124682.

It is an arithmetic number, because the mean of its divisors is an integer number (1000630949292).

Almost surely, 2^{21201021210202} is an apocalyptic number.

21201021210202 is a deficient number, since it is larger than the sum of its proper divisors (10819169167142).

21201021210202 is a wasteful number, since it uses less digits than its factorization.

21201021210202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104374.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21201021210202 its reverse (20201212010212), we get a palindrome (41402233220414).

The spelling of 21201021210202 in words is "twenty-one trillion, two hundred one billion, twenty-one million, two hundred ten thousand, two hundred two".