82113421 has 12 divisors (see below), whose sum is σ = 93334332. Its totient is φ = 71803584.

The previous prime is 82113379. The next prime is 82113439. The reversal of 82113421 is 12431128.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4056196 + 78057225 = 2014^2 + 8835^2 .

It is not a de Polignac number, because 82113421 - 2¹³ = 82105229 is a prime.

It is a super-2 number, since 2×82113421² = 13485227816646482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 82113392 and 82113401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82113121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4056 + ... + 13441.

It is an arithmetic number, because the mean of its divisors is an integer number (7777861).

Almost surely, 2^82113421 is an apocalyptic number.

It is an amenable number.

82113421 is a deficient number, since it is larger than the sum of its proper divisors (11220911).

82113421 is a wasteful number, since it uses less digits than its factorization.

82113421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17548 (or 17529 counting only the distinct ones).

The product of its digits is 384, while the sum is 22.

The square root of 82113421 is about 9061.6456011036. The cubic root of 82113421 is about 434.6483633812.

Adding to 82113421 its reverse (12431128), we get a palindrome (94544549).

The spelling of 82113421 in words is "eighty-two million, one hundred thirteen thousand, four hundred twenty-one".