21201122111210 has 8 divisors (see below), whose sum is σ = 38162019800196. Its totient is φ = 8480448844480.

The previous prime is 21201122111167. The next prime is 21201122111233. The reversal of 21201122111210 is 1211122110212.

It can be written as a sum of positive squares in 2 ways, for example, as 18722729958529 + 2478392152681 = 4326977^2 + 1574291^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1060056105551 + ... + 1060056105570.

Almost surely, 2^{21201122111210} is an apocalyptic number.

21201122111210 is a deficient number, since it is larger than the sum of its proper divisors (16960897688986).

21201122111210 is a wasteful number, since it uses less digits than its factorization.

21201122111210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120112211128.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21201122111210 its reverse (1211122110212), we get a palindrome (22412244221422).

The spelling of 21201122111210 in words is "twenty-one trillion, two hundred one billion, one hundred twenty-two million, one hundred eleven thousand, two hundred ten".