84121771 has 4 divisors (see below), whose sum is σ = 84271752. Its totient is φ = 83971792.

The previous prime is 84121753. The next prime is 84121777. The reversal of 84121771 is 17712148.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 84121771 - 2²¹ = 82024619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84121777) 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, 74146 + ... + 75271.

It is an arithmetic number, because the mean of its divisors is an integer number (21067938).

Almost surely, 2^84121771 is an apocalyptic number.

84121771 is a deficient number, since it is larger than the sum of its proper divisors (149981).

84121771 is a wasteful number, since it uses less digits than its factorization.

84121771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149980.

The product of its digits is 3136, while the sum is 31.

The square root of 84121771 is about 9171.7921367637. The cubic root of 84121771 is about 438.1634381685.

The spelling of 84121771 in words is "eighty-four million, one hundred twenty-one thousand, seven hundred seventy-one".