2221207221 has 16 divisors (see below), whose sum is σ = 3092649984. Its totient is φ = 1415379504.

The previous prime is 2221207211. The next prime is 2221207223. The reversal of 2221207221 is 1227021222.

2221207221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2221207221 - 2⁹ = 2221206709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221207223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88720 + ... + 110966.

It is an arithmetic number, because the mean of its divisors is an integer number (193290624).

Almost surely, 2^2221207221 is an apocalyptic number.

It is an amenable number.

2221207221 is a deficient number, since it is larger than the sum of its proper divisors (871442763).

2221207221 is a wasteful number, since it uses less digits than its factorization.

2221207221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23720.

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 2221207221 is about 47129.6851358037. The cubic root of 2221207221 is about 1304.7571703609.

Adding to 2221207221 its reverse (1227021222), we get a palindrome (3448228443).

The spelling of 2221207221 in words is "two billion, two hundred twenty-one million, two hundred seven thousand, two hundred twenty-one".