83213021221 has 4 divisors (see below), whose sum is σ = 90777841344. Its totient is φ = 75648201100.

The previous prime is 83213021219. The next prime is 83213021237. The reversal of 83213021221 is 12212031238.

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 83213021221 - 2¹ = 83213021219 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 (83213021291) 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, 3782410045 + ... + 3782410066.

It is an arithmetic number, because the mean of its divisors is an integer number (22694460336).

Almost surely, 2^83213021221 is an apocalyptic number.

It is an amenable number.

83213021221 is a deficient number, since it is larger than the sum of its proper divisors (7564820123).

83213021221 is a wasteful number, since it uses less digits than its factorization.

83213021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7564820122.

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

Adding to 83213021221 its reverse (12212031238), we get a palindrome (95425052459).

The spelling of 83213021221 in words is "eighty-three billion, two hundred thirteen million, twenty-one thousand, two hundred twenty-one".