7146521921 has 16 divisors (see below), whose sum is σ = 8928291840. Its totient is φ = 5557254480.

The previous prime is 7146521903. The next prime is 7146521929. The reversal of 7146521921 is 1291256417.

It is a cyclic number.

It is not a de Polignac number, because 7146521921 - 2⁶ = 7146521857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7146521929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57791 + ... + 132788.

It is an arithmetic number, because the mean of its divisors is an integer number (558018240).

Almost surely, 2^7146521921 is an apocalyptic number.

It is an amenable number.

7146521921 is a deficient number, since it is larger than the sum of its proper divisors (1781769919).

7146521921 is a wasteful number, since it uses less digits than its factorization.

7146521921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191084.

The product of its digits is 30240, while the sum is 38.

The square root of 7146521921 is about 84537.1038124680. The cubic root of 7146521921 is about 1926.1860950076.

The spelling of 7146521921 in words is "seven billion, one hundred forty-six million, five hundred twenty-one thousand, nine hundred twenty-one".