21210221211122 has 4 divisors (see below), whose sum is σ = 31815331816686. Its totient is φ = 10605110605560.

The previous prime is 21210221211119. The next prime is 21210221211149. The reversal of 21210221211122 is 22111212201212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11202482634121 + 10007738577001 = 3347011^2 + 3163501^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21210221211094 and 21210221211103.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5302555302779 + ... + 5302555302782.

Almost surely, 2^{21210221211122} is an apocalyptic number.

21210221211122 is a deficient number, since it is larger than the sum of its proper divisors (10605110605564).

21210221211122 is a wasteful number, since it uses less digits than its factorization.

21210221211122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10605110605563.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21210221211122 its reverse (22111212201212), we get a palindrome (43321433412334).

The spelling of 21210221211122 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty-one million, two hundred eleven thousand, one hundred twenty-two".