2102012221 has 4 divisors (see below), whose sum is σ = 2102713344. Its totient is φ = 2101311100.

The previous prime is 2102012219. The next prime is 2102012281. The reversal of 2102012221 is 1222102012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2102012221 - 2¹ = 2102012219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102012281) 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 3 ways as a sum of consecutive naturals, for example, 346045 + ... + 352066.

It is an arithmetic number, because the mean of its divisors is an integer number (525678336).

Almost surely, 2^2102012221 is an apocalyptic number.

It is an amenable number.

2102012221 is a deficient number, since it is larger than the sum of its proper divisors (701123).

2102012221 is an equidigital number, since it uses as much as digits as its factorization.

2102012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701122.

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

The square root of 2102012221 is about 45847.7068237878. The cubic root of 2102012221 is about 1280.9880516054.

Adding to 2102012221 its reverse (1222102012), we get a palindrome (3324114233).

The spelling of 2102012221 in words is "two billion, one hundred two million, twelve thousand, two hundred twenty-one".