4072221221 has 4 divisors (see below), whose sum is σ = 4182281292. Its totient is φ = 3962161152.

The previous prime is 4072221211. The next prime is 4072221313. The reversal of 4072221221 is 1221222704.

4072221221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2949033025 + 1123188196 = 54305^2 + 33514^2 .

It is a cyclic number.

It is not a de Polignac number, because 4072221221 - 2¹⁰ = 4072220197 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 (4072221211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55029980 + ... + 55030053.

It is an arithmetic number, because the mean of its divisors is an integer number (1045570323).

Almost surely, 2^4072221221 is an apocalyptic number.

It is an amenable number.

4072221221 is a deficient number, since it is larger than the sum of its proper divisors (110060071).

4072221221 is a wasteful number, since it uses less digits than its factorization.

4072221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110060070.

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 4072221221 is about 63813.9578854031. The cubic root of 4072221221 is about 1596.8977939034.

Adding to 4072221221 its reverse (1221222704), we get a palindrome (5293443925).

The spelling of 4072221221 in words is "four billion, seventy-two million, two hundred twenty-one thousand, two hundred twenty-one".