84635021 has 8 divisors (see below), whose sum is σ = 89920920. Its totient is φ = 79507008.

The previous prime is 84634981. The next prime is 84635041. The reversal of 84635021 is 12053648.

It can be written as a sum of positive squares in 4 ways, for example, as 23872996 + 60762025 = 4886^2 + 7795^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 84635021 - 2¹⁴ = 84618637 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84635041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38366 + ... + 40511.

It is an arithmetic number, because the mean of its divisors is an integer number (11240115).

Almost surely, 2^84635021 is an apocalyptic number.

It is an amenable number.

84635021 is a deficient number, since it is larger than the sum of its proper divisors (5285899).

84635021 is a wasteful number, since it uses less digits than its factorization.

84635021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78943.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 84635021 is about 9199.7293981943. The cubic root of 84635021 is about 439.0527504098.

Adding to 84635021 its reverse (12053648), we get a palindrome (96688669).

The spelling of 84635021 in words is "eighty-four million, six hundred thirty-five thousand, twenty-one".