84615021 has 12 divisors (see below), whose sum is σ = 125203260. Its totient is φ = 55033920.

The previous prime is 84615017. The next prime is 84615029. The reversal of 84615021 is 12051648.

It can be written as a sum of positive squares in 2 ways, for example, as 1550025 + 83064996 = 1245^2 + 9114^2 .

It is not a de Polignac number, because 84615021 - 2² = 84615017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84615029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 114286 + ... + 115023.

It is an arithmetic number, because the mean of its divisors is an integer number (10433605).

Almost surely, 2^84615021 is an apocalyptic number.

It is an amenable number.

84615021 is a deficient number, since it is larger than the sum of its proper divisors (40588239).

84615021 is a wasteful number, since it uses less digits than its factorization.

84615021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229356 (or 229353 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 84615021 is about 9198.6423454769. The cubic root of 84615021 is about 439.0181636761.

Adding to 84615021 its reverse (12051648), we get a palindrome (96666669).

The spelling of 84615021 in words is "eighty-four million, six hundred fifteen thousand, twenty-one".