8449021221 has 16 divisors (see below), whose sum is σ = 11293941120. Its totient is φ = 5618410560.

The previous prime is 8449021219. The next prime is 8449021237. The reversal of 8449021221 is 1221209448.

It is not a de Polignac number, because 8449021221 - 2¹ = 8449021219 is a prime.

It is a super-3 number, since 3×8449021221³ (a number of 31 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8449021291) 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, 3658015 + ... + 3660323.

It is an arithmetic number, because the mean of its divisors is an integer number (705871320).

Almost surely, 2^8449021221 is an apocalyptic number.

It is an amenable number.

8449021221 is a deficient number, since it is larger than the sum of its proper divisors (2844919899).

8449021221 is a wasteful number, since it uses less digits than its factorization.

8449021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4876.

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 8449021221 is about 91918.5575441651. The cubic root of 8449021221 is about 2036.7394104211.

The spelling of 8449021221 in words is "eight billion, four hundred forty-nine million, twenty-one thousand, two hundred twenty-one".