21212002022 has 16 divisors (see below), whose sum is σ = 32677678800. Its totient is φ = 10323002400.

The previous prime is 21212002013. The next prime is 21212002027. The reversal of 21212002022 is 22020021212.

It is a junction number, because it is equal to n+sod(n) for n = 21212001988 and 21212002006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212002027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 877997 + ... + 901832.

It is an arithmetic number, because the mean of its divisors is an integer number (2042354925).

Almost surely, 2^21212002022 is an apocalyptic number.

21212002022 is a deficient number, since it is larger than the sum of its proper divisors (11465676778).

21212002022 is a wasteful number, since it uses less digits than its factorization.

21212002022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1779991.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21212002022 its reverse (22020021212), we get a palindrome (43232023234).

The spelling of 21212002022 in words is "twenty-one billion, two hundred twelve million, two thousand, twenty-two".