21212112120222 has 32 divisors (see below), whose sum is σ = 42592130208000. Its totient is φ = 7042723371008.

The previous prime is 21212112120209. The next prime is 21212112120239. The reversal of 21212112120222 is 22202121121212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23141479 + ... + 24040637.

It is an arithmetic number, because the mean of its divisors is an integer number (1331004069000).

Almost surely, 2^{21212112120222} is an apocalyptic number.

21212112120222 is an abundant number, since it is smaller than the sum of its proper divisors (21380018087778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21212112120222 is a wasteful number, since it uses less digits than its factorization.

21212112120222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 914720.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21212112120222 its reverse (22202121121212), we get a palindrome (43414233241434).

The spelling of 21212112120222 in words is "twenty-one trillion, two hundred twelve billion, one hundred twelve million, one hundred twenty thousand, two hundred twenty-two".