21111211202122 has 8 divisors (see below), whose sum is σ = 33529570732836. Its totient is φ = 9934687624512.

The previous prime is 21111211202119. The next prime is 21111211202131. The reversal of 21111211202122 is 22120211211112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21041018528401 + 70192673721 = 4587049^2 + 264939^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 21111211202122.

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 3 ways as a sum of consecutive naturals, for example, 310458988233 + ... + 310458988300.

Almost surely, 2^{21111211202122} is an apocalyptic number.

21111211202122 is a deficient number, since it is larger than the sum of its proper divisors (12418359530714).

21111211202122 is a wasteful number, since it uses less digits than its factorization.

21111211202122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620917976552.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21111211202122 its reverse (22120211211112), we get a palindrome (43231422413234).

The spelling of 21111211202122 in words is "twenty-one trillion, one hundred eleven billion, two hundred eleven million, two hundred two thousand, one hundred twenty-two".