83138421 has 4 divisors (see below), whose sum is σ = 110851232. Its totient is φ = 55425612.

The previous prime is 83138411. The next prime is 83138423. The reversal of 83138421 is 12483138.

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 not a de Polignac number, because 83138421 - 2⁹ = 83137909 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 (83138423) 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, 13856401 + ... + 13856406.

It is an arithmetic number, because the mean of its divisors is an integer number (27712808).

Almost surely, 2^83138421 is an apocalyptic number.

It is an amenable number.

83138421 is a deficient number, since it is larger than the sum of its proper divisors (27712811).

83138421 is a wasteful number, since it uses less digits than its factorization.

83138421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27712810.

The product of its digits is 4608, while the sum is 30.

The square root of 83138421 is about 9118.0272537430. The cubic root of 83138421 is about 436.4494233048.

It can be divided in two parts, 831384 and 21, that added together give a triangular number (831405 = T₁₂₈₉).

The spelling of 83138421 in words is "eighty-three million, one hundred thirty-eight thousand, four hundred twenty-one".