84975021 has 8 divisors (see below), whose sum is σ = 125888960. Its totient is φ = 56649996.

The previous prime is 84975019. The next prime is 84975047. The reversal of 84975021 is 12057948.

It is not a de Polignac number, because 84975021 - 2¹ = 84975019 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 (84955021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1573585 + ... + 1573638.

It is an arithmetic number, because the mean of its divisors is an integer number (15736120).

Almost surely, 2^84975021 is an apocalyptic number.

It is an amenable number.

84975021 is a deficient number, since it is larger than the sum of its proper divisors (40913939).

84975021 is a wasteful number, since it uses less digits than its factorization.

84975021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3147232 (or 3147226 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 84975021 is about 9218.1896812769. The cubic root of 84975021 is about 439.6398930321.

It can be divided in two parts, 8497502 and 1, that added together give a triangular number (8497503 = T₄₁₂₂).

The spelling of 84975021 in words is "eighty-four million, nine hundred seventy-five thousand, twenty-one".