2012220021 has 16 divisors (see below), whose sum is σ = 3199555584. Its totient is φ = 1099846704.

The previous prime is 2012220019. The next prime is 2012220031. The reversal of 2012220021 is 1200222102.

It is not a de Polignac number, because 2012220021 - 2¹ = 2012220019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2012219979 and 2012220006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2012220031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2082561 + ... + 2083526.

It is an arithmetic number, because the mean of its divisors is an integer number (199972224).

Almost surely, 2^2012220021 is an apocalyptic number.

2012220021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2012220021 is a deficient number, since it is larger than the sum of its proper divisors (1187335563).

2012220021 is a wasteful number, since it uses less digits than its factorization.

2012220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4166120.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 2012220021 is about 44857.7754798430. The cubic root of 2012220021 is about 1262.4818849932.

Adding to 2012220021 its reverse (1200222102), we get a palindrome (3212442123).

It can be divided in two parts, 201 and 2220021, that added together give a palindrome (2220222).

The spelling of 2012220021 in words is "two billion, twelve million, two hundred twenty thousand, twenty-one".