222121100012 has 24 divisors (see below), whose sum is σ = 448640643360. Its totient is φ = 94252233600.

The previous prime is 222121099999. The next prime is 222121100021. The reversal of 222121100012 is 210001121222.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a self number, because there is not a number n which added to its sum of digits gives 222121100012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39268937 + ... + 39274592.

It is an arithmetic number, because the mean of its divisors is an integer number (18693360140).

Almost surely, 2^222121100012 is an apocalyptic number.

It is an amenable number.

222121100012 is an abundant number, since it is smaller than the sum of its proper divisors (226519543348).

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

222121100012 is a wasteful number, since it uses less digits than its factorization.

222121100012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78543641 (or 78543639 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 222121100012 its reverse (210001121222), we get a palindrome (432122221234).

The spelling of 222121100012 in words is "two hundred twenty-two billion, one hundred twenty-one million, one hundred thousand, twelve".