21222200122 has 4 divisors (see below), whose sum is σ = 31833300186. Its totient is φ = 10611100060.

The previous prime is 21222200101. The next prime is 21222200123. The reversal of 21222200122 is 22100222212.

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., 14404560361 + 6817639761 = 120019^2 + 82569^2 .

It is a super-3 number, since 3×21222200122³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21222200096 and 21222200105.

It is not an unprimeable number, because it can be changed into a prime (21222200123) 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, 5305550029 + ... + 5305550032.

Almost surely, 2^21222200122 is an apocalyptic number.

21222200122 is a deficient number, since it is larger than the sum of its proper divisors (10611100064).

21222200122 is a wasteful number, since it uses less digits than its factorization.

21222200122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10611100063.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21222200122 its reverse (22100222212), we get a palindrome (43322422334).

The spelling of 21222200122 in words is "twenty-one billion, two hundred twenty-two million, two hundred thousand, one hundred twenty-two".