2012221021 has 2 divisors, whose sum is σ = 2012221022. Its totient is φ = 2012221020.

The previous prime is 2012221007. The next prime is 2012221027. The reversal of 2012221021 is 1201222102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1729644921 + 282576100 = 41589^2 + 16810^2 .

It is a cyclic number.

It is not a de Polignac number, because 2012221021 - 2⁵ = 2012220989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2012220992 and 2012221010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2012221027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1006110510 + 1006110511.

It is an arithmetic number, because the mean of its divisors is an integer number (1006110511).

Almost surely, 2^2012221021 is an apocalyptic number.

It is an amenable number.

2012221021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2012221021 is an equidigital number, since it uses as much as digits as its factorization.

2012221021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 2012221021 is about 44857.7866261812. The cubic root of 2012221021 is about 1262.4820941289.

Adding to 2012221021 its reverse (1201222102), we get a palindrome (3213443123).

It can be divided in two parts, 201 and 2221021, that added together give a palindrome (2221222).

The spelling of 2012221021 in words is "two billion, twelve million, two hundred twenty-one thousand, twenty-one".