8461081021 has 4 divisors (see below), whose sum is σ = 8478455392. Its totient is φ = 8443706652.

The previous prime is 8461081003. The next prime is 8461081037. The reversal of 8461081021 is 1201801648.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8461081021 - 2¹¹ = 8461078973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8461081721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8686455 + ... + 8687428.

It is an arithmetic number, because the mean of its divisors is an integer number (2119613848).

Almost surely, 2^8461081021 is an apocalyptic number.

It is an amenable number.

8461081021 is a deficient number, since it is larger than the sum of its proper divisors (17374371).

8461081021 is a wasteful number, since it uses less digits than its factorization.

8461081021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17374370.

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 8461081021 is about 91984.1346157042. The cubic root of 8461081021 is about 2037.7080035856.

Adding to 8461081021 its reverse (1201801648), we get a palindrome (9662882669).

The spelling of 8461081021 in words is "eight billion, four hundred sixty-one million, eighty-one thousand, twenty-one".