212215172409 has 24 divisors (see below), whose sum is σ = 308949189120. Its totient is φ = 140362826688.

The previous prime is 212215172387. The next prime is 212215172423. The reversal of 212215172409 is 904271512212.

It is a happy number.

212215172409 is a `hidden beast` number, since 21 + 2 + 215 + 17 + 2 + 409 = 666.

It is not a de Polignac number, because 212215172409 - 2⁹ = 212215171897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212215172479) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2119924 + ... + 2217770.

It is an arithmetic number, because the mean of its divisors is an integer number (12872882880).

Almost surely, 2^212215172409 is an apocalyptic number.

It is an amenable number.

212215172409 is a deficient number, since it is larger than the sum of its proper divisors (96734016711).

212215172409 is a wasteful number, since it uses less digits than its factorization.

212215172409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99749 (or 99746 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The spelling of 212215172409 in words is "two hundred twelve billion, two hundred fifteen million, one hundred seventy-two thousand, four hundred nine".