7146197721 has 24 divisors (see below), whose sum is σ = 11257034880. Its totient is φ = 4341987936.

The previous prime is 7146197633. The next prime is 7146197743. The reversal of 7146197721 is 1277916417.

7146197721 is a `hidden beast` number, since 7 + 1 + 4 + 619 + 7 + 7 + 21 = 666.

It is not a de Polignac number, because 7146197721 - 2¹⁰ = 7146196697 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7146197761) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 377331 + ... + 395816.

It is an arithmetic number, because the mean of its divisors is an integer number (469043120).

Almost surely, 2^7146197721 is an apocalyptic number.

It is an amenable number.

7146197721 is a deficient number, since it is larger than the sum of its proper divisors (4110837159).

7146197721 is a wasteful number, since it uses less digits than its factorization.

7146197721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773245 (or 773242 counting only the distinct ones).

The product of its digits is 148176, while the sum is 45.

The square root of 7146197721 is about 84535.1862894972. The cubic root of 7146197721 is about 1926.1569675998.

The spelling of 7146197721 in words is "seven billion, one hundred forty-six million, one hundred ninety-seven thousand, seven hundred twenty-one".