2221221212112 has 40 divisors (see below), whose sum is σ = 6557891198656. Its totient is φ = 634634631936.

The previous prime is 2221221212099. The next prime is 2221221212113. The reversal of 2221221212112 is 2112121221222.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221221212113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3305388373 + ... + 3305389044.

Almost surely, 2^{2221221212112} is an apocalyptic number.

It is an amenable number.

2221221212112 is an abundant number, since it is smaller than the sum of its proper divisors (4336669986544).

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

2221221212112 is a wasteful number, since it uses less digits than its factorization.

2221221212112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6610777435 (or 6610777429 counting only the distinct ones).

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

Adding to 2221221212112 its reverse (2112121221222), we get a palindrome (4333342433334).

The spelling of 2221221212112 in words is "two trillion, two hundred twenty-one billion, two hundred twenty-one million, two hundred twelve thousand, one hundred twelve".