221212110011012 has 24 divisors (see below), whose sum is σ = 389285930960472. Its totient is φ = 109987639776000.

The previous prime is 221212110010889. The next prime is 221212110011033. The reversal of 221212110011012 is 210110011212122.

It can be written as a sum of positive squares in 4 ways, for example, as 547502324356 + 220664607686656 = 739934^2 + 14854784^2 .

It is a super-2 number, since 2×221212110011012² (a number of 29 digits) contains 22 as substring.

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 in 7 ways as a sum of consecutive naturals, for example, 693512 + ... + 21045312.

It is an arithmetic number, because the mean of its divisors is an integer number (16220247123353).

Almost surely, 2^{221212110011012} is an apocalyptic number.

It is an amenable number.

221212110011012 is a deficient number, since it is larger than the sum of its proper divisors (168073820949460).

221212110011012 is a wasteful number, since it uses less digits than its factorization.

221212110011012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20366999 (or 20366997 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 221212110011012 its reverse (210110011212122), we get a palindrome (431322121223134).

The spelling of 221212110011012 in words is "two hundred twenty-one trillion, two hundred twelve billion, one hundred ten million, eleven thousand, twelve".