83907221 has 4 divisors (see below), whose sum is σ = 83955072. Its totient is φ = 83859372.

The previous prime is 83907217. The next prime is 83907247. The reversal of 83907221 is 12270938.

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 83907221 - 2² = 83907217 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 (83907281) 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, 21191 + ... + 24836.

It is an arithmetic number, because the mean of its divisors is an integer number (20988768).

Almost surely, 2^83907221 is an apocalyptic number.

It is an amenable number.

83907221 is a deficient number, since it is larger than the sum of its proper divisors (47851).

83907221 is a wasteful number, since it uses less digits than its factorization.

83907221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47850.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 83907221 is about 9160.0884821054. The cubic root of 83907221 is about 437.7906135539.

The spelling of 83907221 in words is "eighty-three million, nine hundred seven thousand, two hundred twenty-one".