2221225421 has 16 divisors (see below), whose sum is σ = 2273040000. Its totient is φ = 2170181376.

The previous prime is 2221225379. The next prime is 2221225427. The reversal of 2221225421 is 1245221222.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2221225421 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 (2221225427) 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, 5059520 + ... + 5059958.

It is an arithmetic number, because the mean of its divisors is an integer number (142065000).

Almost surely, 2^2221225421 is an apocalyptic number.

It is an amenable number.

2221225421 is a deficient number, since it is larger than the sum of its proper divisors (51814579).

2221225421 is a wasteful number, since it uses less digits than its factorization.

2221225421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076.

The product of its digits is 1280, while the sum is 23.

The square root of 2221225421 is about 47129.8782196602. The cubic root of 2221225421 is about 1304.7607339659.

Adding to 2221225421 its reverse (1245221222), we get a palindrome (3466446643).

The spelling of 2221225421 in words is "two billion, two hundred twenty-one million, two hundred twenty-five thousand, four hundred twenty-one".