7272906221 has 32 divisors (see below), whose sum is σ = 9057692160. Its totient is φ = 5696649216.

The previous prime is 7272906197. The next prime is 7272906227. The reversal of 7272906221 is 1226092727.

It is a cyclic number.

It is not a de Polignac number, because 7272906221 - 2¹⁰ = 7272905197 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 (7272906227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2503856 + ... + 2506758.

It is an arithmetic number, because the mean of its divisors is an integer number (283052880).

Almost surely, 2^7272906221 is an apocalyptic number.

It is an amenable number.

7272906221 is a deficient number, since it is larger than the sum of its proper divisors (1784785939).

7272906221 is a wasteful number, since it uses less digits than its factorization.

7272906221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3533.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 7272906221 is about 85281.3357130386. The cubic root of 7272906221 is about 1937.4745028126.

Adding to 7272906221 its reverse (1226092727), we get a palindrome (8498998948).

The spelling of 7272906221 in words is "seven billion, two hundred seventy-two million, nine hundred six thousand, two hundred twenty-one".