21101201222212 has 6 divisors (see below), whose sum is σ = 36927102138878. Its totient is φ = 10550600611104.

The previous prime is 21101201222173. The next prime is 21101201222219. The reversal of 21101201222212 is 21222210210112.

It can be written as a sum of positive squares in only one way, i.e., 19254684416256 + 1846516805956 = 4388016^2 + 1358866^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21101201222212.

It is not an unprimeable number, because it can be changed into a prime (21101201222219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2637650152773 + ... + 2637650152780.

Almost surely, 2^{21101201222212} is an apocalyptic number.

It is an amenable number.

21101201222212 is a deficient number, since it is larger than the sum of its proper divisors (15825900916666).

21101201222212 is a wasteful number, since it uses less digits than its factorization.

21101201222212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5275300305557 (or 5275300305555 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21101201222212 its reverse (21222210210112), we get a palindrome (42323411432324).

The spelling of 21101201222212 in words is "twenty-one trillion, one hundred one billion, two hundred one million, two hundred twenty-two thousand, two hundred twelve".