7021491840 has 192 divisors, whose sum is σ = 26450517600. Its totient is φ = 1702164480.

The previous prime is 7021491817. The next prime is 7021491881. The reversal of 7021491840 is 481941207.

7021491840 is a `hidden beast` number, since 70 + 21 + 491 + 84 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

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

It is a junction number, because it is equal to n+sod(n) for n = 7021491795 and 7021491804.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7951 + ... + 118769.

Almost surely, 2^7021491840 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 7021491840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13225258800).

7021491840 is an abundant number, since it is smaller than the sum of its proper divisors (19429025760).

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

7021491840 is a wasteful number, since it uses less digits than its factorization.

7021491840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110855 (or 110840 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 7021491840 is about 83794.3425297914. The cubic root of 7021491840 is about 1914.8869164500.

The spelling of 7021491840 in words is "seven billion, twenty-one million, four hundred ninety-one thousand, eight hundred forty".