101818213 has 4 divisors (see below), whose sum is σ = 116363680. Its totient is φ = 87272748.

The previous prime is 101818177. The next prime is 101818231. The reversal of 101818213 is 312818101.

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, and also an emirpimes, since its reverse is a distinct semiprime: 312818101 = 23 ⋅13600787.

It is a cyclic number.

It is not a de Polignac number, because 101818213 - 2²⁵ = 68263781 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 (101818273) 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, 7272723 + ... + 7272736.

It is an arithmetic number, because the mean of its divisors is an integer number (29090920).

Almost surely, 2^101818213 is an apocalyptic number.

It is an amenable number.

101818213 is a deficient number, since it is larger than the sum of its proper divisors (14545467).

101818213 is an equidigital number, since it uses as much as digits as its factorization.

101818213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14545466.

The product of its (nonzero) digits is 384, while the sum is 25.

The square root of 101818213 is about 10090.5011272979. The cubic root of 101818213 is about 466.9551363285.

The spelling of 101818213 in words is "one hundred one million, eight hundred eighteen thousand, two hundred thirteen".