84857256421 has 16 divisors (see below), whose sum is σ = 99487035648. Its totient is φ = 70859376000.

The previous prime is 84857256409. The next prime is 84857256437. The reversal of 84857256421 is 12465275848.

It is not a de Polignac number, because 84857256421 - 2⁷ = 84857256293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84857256821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9705 + ... + 412078.

It is an arithmetic number, because the mean of its divisors is an integer number (6217939728).

Almost surely, 2^84857256421 is an apocalyptic number.

It is an amenable number.

84857256421 is a deficient number, since it is larger than the sum of its proper divisors (14629779227).

84857256421 is a wasteful number, since it uses less digits than its factorization.

84857256421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422532.

The product of its digits is 4300800, while the sum is 52.

The spelling of 84857256421 in words is "eighty-four billion, eight hundred fifty-seven million, two hundred fifty-six thousand, four hundred twenty-one".