21212020022 has 8 divisors (see below), whose sum is σ = 32594079672. Its totient is φ = 10347326800.

The previous prime is 21212020021. The next prime is 21212020087. The reversal of 21212020022 is 22002021212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21212019979 and 21212020006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212020021) 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 3 ways as a sum of consecutive naturals, for example, 129341504 + ... + 129341667.

It is an arithmetic number, because the mean of its divisors is an integer number (4074259959).

Almost surely, 2^21212020022 is an apocalyptic number.

21212020022 is a deficient number, since it is larger than the sum of its proper divisors (11382059650).

21212020022 is a wasteful number, since it uses less digits than its factorization.

21212020022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258683214.

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

Adding to 21212020022 its reverse (22002021212), we get a palindrome (43214041234).

The spelling of 21212020022 in words is "twenty-one billion, two hundred twelve million, twenty thousand, twenty-two".