106212215 has 4 divisors (see below), whose sum is σ = 127454664. Its totient is φ = 84969768.

The previous prime is 106212191. The next prime is 106212221. The reversal of 106212215 is 512212601.

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 106212215 - 2¹⁰ = 106211191 is a prime.

It is a super-2 number, since 2×106212215² = 22562069230412450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10621217 + ... + 10621226.

It is an arithmetic number, because the mean of its divisors is an integer number (31863666).

Almost surely, 2^106212215 is an apocalyptic number.

106212215 is a deficient number, since it is larger than the sum of its proper divisors (21242449).

106212215 is an equidigital number, since it uses as much as digits as its factorization.

106212215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21242448.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 106212215 is about 10305.9310593464. The cubic root of 106212215 is about 473.5779667905.

Adding to 106212215 its reverse (512212601), we get a palindrome (618424816).

The spelling of 106212215 in words is "one hundred six million, two hundred twelve thousand, two hundred fifteen".