212012220021 has 16 divisors (see below), whose sum is σ = 323456914944. Its totient is φ = 121003336944.

The previous prime is 212012220011. The next prime is 212012220023. The reversal of 212012220021 is 120022210212.

It is not a de Polignac number, because 212012220021 - 2⁷ = 212012219893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212012220023) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 6086515 + ... + 6121248.

It is an arithmetic number, because the mean of its divisors is an integer number (20216057184).

Almost surely, 2^212012220021 is an apocalyptic number.

212012220021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

212012220021 is a deficient number, since it is larger than the sum of its proper divisors (111444694923).

212012220021 is a wasteful number, since it uses less digits than its factorization.

212012220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12208600.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 212012220021 its reverse (120022210212), we get a palindrome (332034430233).

The spelling of 212012220021 in words is "two hundred twelve billion, twelve million, two hundred twenty thousand, twenty-one".