83121213 has 8 divisors (see below), whose sum is σ = 126660928. Its totient is φ = 47497824.

The previous prime is 83121209. The next prime is 83121217. The reversal of 83121213 is 31212138.

It is an interprime number because it is at equal distance from previous prime (83121209) and next prime (83121217).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 83121213 - 2² = 83121209 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 3958153 = 83121213 / (8 + 3 + 1 + 2 + 1 + 2 + 1 + 3).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 83121213.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 1979056 + ... + 1979097.

It is an arithmetic number, because the mean of its divisors is an integer number (15832616).

Almost surely, 2^83121213 is an apocalyptic number.

It is an amenable number.

83121213 is a deficient number, since it is larger than the sum of its proper divisors (43539715).

83121213 is a wasteful number, since it uses less digits than its factorization.

83121213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3958163.

The product of its digits is 288, while the sum is 21.

The square root of 83121213 is about 9117.0835797419. The cubic root of 83121213 is about 436.4193091097.

The spelling of 83121213 in words is "eighty-three million, one hundred twenty-one thousand, two hundred thirteen".