7221491424 has 432 divisors, whose sum is σ = 26261988480. Its totient is φ = 1868106240.

The previous prime is 7221491419. The next prime is 7221491467. The reversal of 7221491424 is 4241941227.

It is a happy number.

7221491424 is a `hidden beast` number, since 7 + 221 + 4 + 9 + 1 + 424 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

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 71 ways as a sum of consecutive naturals, for example, 6166359 + ... + 6167529.

It is an arithmetic number, because the mean of its divisors is an integer number (60791640).

Almost surely, 2^7221491424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7221491424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13130994240).

7221491424 is an abundant number, since it is smaller than the sum of its proper divisors (19040497056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7221491424 is a wasteful number, since it uses less digits than its factorization.

7221491424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1243 (or 1225 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 7221491424 is about 84979.3588114196. The cubic root of 7221491424 is about 1932.8981331428.

The spelling of 7221491424 in words is "seven billion, two hundred twenty-one million, four hundred ninety-one thousand, four hundred twenty-four".