84691200421 has 4 divisors (see below), whose sum is σ = 84749569344. Its totient is φ = 84632831500.

The previous prime is 84691200413. The next prime is 84691200493. The reversal of 84691200421 is 12400219648.

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 84691200421 - 2³ = 84691200413 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 (84691200221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29182285 + ... + 29185186.

It is an arithmetic number, because the mean of its divisors is an integer number (21187392336).

Almost surely, 2^84691200421 is an apocalyptic number.

It is an amenable number.

84691200421 is a deficient number, since it is larger than the sum of its proper divisors (58368923).

84691200421 is a wasteful number, since it uses less digits than its factorization.

84691200421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58368922.

The product of its (nonzero) digits is 27648, while the sum is 37.

The spelling of 84691200421 in words is "eighty-four billion, six hundred ninety-one million, two hundred thousand, four hundred twenty-one".