83136921 has 16 divisors (see below), whose sum is σ = 126827904. Its totient is φ = 47453184.

The previous prime is 83136901. The next prime is 83136929. The reversal of 83136921 is 12963138.

It is not a de Polignac number, because 83136921 - 2¹³ = 83128729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (83136929) 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 15 ways as a sum of consecutive naturals, for example, 23931 + ... + 27183.

It is an arithmetic number, because the mean of its divisors is an integer number (7926744).

Almost surely, 2^83136921 is an apocalyptic number.

It is an amenable number.

83136921 is a deficient number, since it is larger than the sum of its proper divisors (43690983).

83136921 is a wasteful number, since it uses less digits than its factorization.

83136921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4480.

The product of its digits is 7776, while the sum is 33.

The square root of 83136921 is about 9117.9449987374. The cubic root of 83136921 is about 436.4467984532.

The spelling of 83136921 in words is "eighty-three million, one hundred thirty-six thousand, nine hundred twenty-one".