83212621 has 4 divisors (see below), whose sum is σ = 83241052. Its totient is φ = 83184192.

The previous prime is 83212573. The next prime is 83212631. The reversal of 83212621 is 12621238.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64979721 + 18232900 = 8061^2 + 4270^2 .

It is a cyclic number.

It is not a de Polignac number, because 83212621 - 2⁹ = 83212109 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 (83212631) 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, 9246 + ... + 15871.

It is an arithmetic number, because the mean of its divisors is an integer number (20810263).

Almost surely, 2^83212621 is an apocalyptic number.

It is an amenable number.

83212621 is a deficient number, since it is larger than the sum of its proper divisors (28431).

83212621 is a wasteful number, since it uses less digits than its factorization.

83212621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28430.

The product of its digits is 1152, while the sum is 25.

The square root of 83212621 is about 9122.0952088870. The cubic root of 83212621 is about 436.5792265788.

Adding to 83212621 its reverse (12621238), we get a palindrome (95833859).

The spelling of 83212621 in words is "eighty-three million, two hundred twelve thousand, six hundred twenty-one".