20121122222 has 4 divisors (see below), whose sum is σ = 30181683336. Its totient is φ = 10060561110.

The previous prime is 20121122209. The next prime is 20121122237. The reversal of 20121122222 is 22222112102.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20121122222.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5030280554 + ... + 5030280557.

It is an arithmetic number, because the mean of its divisors is an integer number (7545420834).

Almost surely, 2^20121122222 is an apocalyptic number.

20121122222 is a deficient number, since it is larger than the sum of its proper divisors (10060561114).

20121122222 is a wasteful number, since it uses less digits than its factorization.

20121122222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10060561113.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20121122222 its reverse (22222112102), we get a palindrome (42343234324).

The spelling of 20121122222 in words is "twenty billion, one hundred twenty-one million, one hundred twenty-two thousand, two hundred twenty-two".