222121121010012 has 144 divisors (see below), whose sum is σ = 665779245797120. Its totient is φ = 63431709368832.

The previous prime is 222121121009987. The next prime is 222121121010013. The reversal of 222121121010012 is 210010121121222.

222121121010012 is a `hidden beast` number, since 2 + 221 + 211 + 210 + 10 + 0 + 12 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222121121010013) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5631039 + ... + 21816297.

Almost surely, 2^{222121121010012} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 222121121010012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (332889622898560).

222121121010012 is an abundant number, since it is smaller than the sum of its proper divisors (443658124787108).

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

222121121010012 is a wasteful number, since it uses less digits than its factorization.

222121121010012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16187302 (or 16187288 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 222121121010012 its reverse (210010121121222), we get a palindrome (432131242131234).

It can be divided in two parts, 2221211210 and 10012, that added together give a palindrome (2221221222).

The spelling of 222121121010012 in words is "two hundred twenty-two trillion, one hundred twenty-one billion, one hundred twenty-one million, ten thousand, twelve".