20121213222 has 24 divisors (see below), whose sum is σ = 47559231720. Its totient is φ = 6097337280.

The previous prime is 20121213187. The next prime is 20121213239. The reversal of 20121213222 is 22231212102.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20121213195 and 20121213204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50810947 + ... + 50811342.

It is an arithmetic number, because the mean of its divisors is an integer number (1981634655).

Almost surely, 2^20121213222 is an apocalyptic number.

20121213222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20121213222 is an abundant number, since it is smaller than the sum of its proper divisors (27438018498).

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

20121213222 is a wasteful number, since it uses less digits than its factorization.

20121213222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101622308 (or 101622305 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 20121213222 its reverse (22231212102), we get a palindrome (42352425324).

The spelling of 20121213222 in words is "twenty billion, one hundred twenty-one million, two hundred thirteen thousand, two hundred twenty-two".