21201022202122 has 64 divisors (see below), whose sum is σ = 39140288225280. Its totient is φ = 8405544672000.

The previous prime is 21201022202033. The next prime is 21201022202141. The reversal of 21201022202122 is 22120222010212.

It is a self number, because there is not a number n which added to its sum of digits gives 21201022202122.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 103120047 + ... + 103325437.

It is an arithmetic number, because the mean of its divisors is an integer number (611567003520).

Almost surely, 2^{21201022202122} is an apocalyptic number.

21201022202122 is a deficient number, since it is larger than the sum of its proper divisors (17939266023158).

21201022202122 is a wasteful number, since it uses less digits than its factorization.

21201022202122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212827.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21201022202122 its reverse (22120222010212), we get a palindrome (43321244212334).

The spelling of 21201022202122 in words is "twenty-one trillion, two hundred one billion, twenty-two million, two hundred two thousand, one hundred twenty-two".