221212122200122 has 4 divisors (see below), whose sum is σ = 331818183300186. Its totient is φ = 110606061100060.

The previous prime is 221212122200119. The next prime is 221212122200123. The reversal of 221212122200122 is 221002221212122.

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., 208580289251481 + 12631832948641 = 14442309^2 + 3554129^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221212122200093 and 221212122200102.

It is not an unprimeable number, because it can be changed into a prime (221212122200123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55303030550029 + ... + 55303030550032.

Almost surely, 2^{221212122200122} is an apocalyptic number.

221212122200122 is a deficient number, since it is larger than the sum of its proper divisors (110606061100064).

221212122200122 is a wasteful number, since it uses less digits than its factorization.

221212122200122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110606061100063.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 221212122200122 its reverse (221002221212122), we get a palindrome (442214343412244).

The spelling of 221212122200122 in words is "two hundred twenty-one trillion, two hundred twelve billion, one hundred twenty-two million, two hundred thousand, one hundred twenty-two".