101212209 has 12 divisors (see below), whose sum is σ = 167080576. Its totient is φ = 57835512.

The previous prime is 101212207. The next prime is 101212211. The reversal of 101212209 is 902212101.

It is an interprime number because it is at equal distance from previous prime (101212207) and next prime (101212211).

It is not a de Polignac number, because 101212209 - 2¹ = 101212207 is a prime.

It is a super-2 number, since 2×101212209² = 20487822501319362, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101212191 and 101212200.

It is not an unprimeable number, because it can be changed into a prime (101212207) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 803209 + ... + 803334.

Almost surely, 2^101212209 is an apocalyptic number.

It is an amenable number.

101212209 is a deficient number, since it is larger than the sum of its proper divisors (65868367).

101212209 is a wasteful number, since it uses less digits than its factorization.

101212209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1606556 (or 1606553 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 101212209 is about 10060.4278736046. The cubic root of 101212209 is about 466.0268808135.

The spelling of 101212209 in words is "one hundred one million, two hundred twelve thousand, two hundred nine".