83121211 has 4 divisors (see below), whose sum is σ = 88010712. Its totient is φ = 78231712.

The previous prime is 83121209. The next prime is 83121217. The reversal of 83121211 is 11212138.

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

It is a cyclic number.

It is not a de Polignac number, because 83121211 - 2¹ = 83121209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83121217) 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, 2444725 + ... + 2444758.

It is an arithmetic number, because the mean of its divisors is an integer number (22002678).

Almost surely, 2^83121211 is an apocalyptic number.

83121211 is a deficient number, since it is larger than the sum of its proper divisors (4889501).

83121211 is a wasteful number, since it uses less digits than its factorization.

83121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4889500.

The product of its digits is 96, while the sum is 19.

The square root of 83121211 is about 9117.0834700577. The cubic root of 83121211 is about 436.4193056094.

Adding to 83121211 its reverse (11212138), we get a palindrome (94333349).

The spelling of 83121211 in words is "eighty-three million, one hundred twenty-one thousand, two hundred eleven".