21212002202222 has 32 divisors (see below), whose sum is σ = 37637208645120. Its totient is φ = 8871627742560.

The previous prime is 21212002202207. The next prime is 21212002202227. The reversal of 21212002202222 is 22220220021212.

It is a junction number, because it is equal to n+sod(n) for n = 21212002202194 and 21212002202203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212002202227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 933451154 + ... + 933473877.

It is an arithmetic number, because the mean of its divisors is an integer number (1176162770160).

Almost surely, 2^{21212002202222} is an apocalyptic number.

21212002202222 is a deficient number, since it is larger than the sum of its proper divisors (16425206442898).

21212002202222 is a wasteful number, since it uses less digits than its factorization.

21212002202222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1866925088.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21212002202222 its reverse (22220220021212), we get a palindrome (43432222223434).

The spelling of 21212002202222 in words is "twenty-one trillion, two hundred twelve billion, two million, two hundred two thousand, two hundred twenty-two".