83712421 has 8 divisors (see below), whose sum is σ = 91166040. Its totient is φ = 76403712.

The previous prime is 83712401. The next prime is 83712449. The reversal of 83712421 is 12421738.

It can be written as a sum of positive squares in 4 ways, for example, as 9235521 + 74476900 = 3039^2 + 8630^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 83712421 - 2⁹ = 83711909 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 83712421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83712401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35020 + ... + 37333.

It is an arithmetic number, because the mean of its divisors is an integer number (11395755).

Almost surely, 2^83712421 is an apocalyptic number.

It is an amenable number.

83712421 is a deficient number, since it is larger than the sum of its proper divisors (7453619).

83712421 is a wasteful number, since it uses less digits than its factorization.

83712421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72455.

The product of its digits is 2688, while the sum is 28.

The square root of 83712421 is about 9149.4492183956. The cubic root of 83712421 is about 437.4515577385.

The spelling of 83712421 in words is "eighty-three million, seven hundred twelve thousand, four hundred twenty-one".