21212011220222 has 4 divisors (see below), whose sum is σ = 31818016830336. Its totient is φ = 10606005610110.

The previous prime is 21212011220209. The next prime is 21212011220273. The reversal of 21212011220222 is 22202211021212.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21212011220194 and 21212011220203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5303002805054 + ... + 5303002805057.

It is an arithmetic number, because the mean of its divisors is an integer number (7954504207584).

Almost surely, 2^{21212011220222} is an apocalyptic number.

21212011220222 is a deficient number, since it is larger than the sum of its proper divisors (10606005610114).

21212011220222 is a wasteful number, since it uses less digits than its factorization.

21212011220222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10606005610113.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21212011220222 its reverse (22202211021212), we get a palindrome (43414222241434).

The spelling of 21212011220222 in words is "twenty-one trillion, two hundred twelve billion, eleven million, two hundred twenty thousand, two hundred twenty-two".