84851021 has 4 divisors (see below), whose sum is σ = 85461600. Its totient is φ = 84240444.

The previous prime is 84850973. The next prime is 84851033. The reversal of 84851021 is 12015848.

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 84851021 - 2⁶ = 84850957 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 (84851821) 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, 305081 + ... + 305358.

It is an arithmetic number, because the mean of its divisors is an integer number (21365400).

Almost surely, 2^84851021 is an apocalyptic number.

It is an amenable number.

84851021 is a deficient number, since it is larger than the sum of its proper divisors (610579).

84851021 is a wasteful number, since it uses less digits than its factorization.

84851021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610578.

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 84851021 is about 9211.4613932861. The cubic root of 84851021 is about 439.4259404107.

Adding to 84851021 its reverse (12015848), we get a palindrome (96866869).

The spelling of 84851021 in words is "eighty-four million, eight hundred fifty-one thousand, twenty-one".