7216229421 has 12 divisors (see below), whose sum is σ = 10424222172. Its totient is φ = 4810459776.

The previous prime is 7216229401. The next prime is 7216229429. The reversal of 7216229421 is 1249226127.

7216229421 is a `hidden beast` number, since 7 + 2 + 1 + 6 + 229 + 421 = 666.

7216229421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 4717629225 + 2498600196 = 68685^2 + 49986^2 .

It is not a de Polignac number, because 7216229421 - 2¹¹ = 7216227373 is a prime.

It is a super-3 number, since 3×7216229421³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7216229429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 161125 + ... + 200981.

It is an arithmetic number, because the mean of its divisors is an integer number (868685181).

Almost surely, 2^7216229421 is an apocalyptic number.

It is an amenable number.

7216229421 is a deficient number, since it is larger than the sum of its proper divisors (3207992751).

7216229421 is a wasteful number, since it uses less digits than its factorization.

7216229421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59980 (or 59977 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 7216229421 is about 84948.3926922693. The cubic root of 7216229421 is about 1932.4285446809.

The spelling of 7216229421 in words is "seven billion, two hundred sixteen million, two hundred twenty-nine thousand, four hundred twenty-one".