2217129934009 has 3 divisors (see below), whose sum is σ = 2217131423013. Its totient is φ = 2217128445006.

The previous prime is 2217129934001. The next prime is 2217129934037. The reversal of 2217129934009 is 9004399217122.

It is a happy number.

The square root of 2217129934009 is 1489003.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 2217129934009 - 2³ = 2217129934001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2217129934001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 744502 + ... + 2233504.

It is an arithmetic number, because the mean of its divisors is an integer number (739043807671).

Almost surely, 2^{2217129934009} is an apocalyptic number.

2217129934009 is the 1489003-rd square number.

2217129934009 is the 744502-nd centered octagonal number.

It is an amenable number.

2217129934009 is a deficient number, since it is larger than the sum of its proper divisors (1489004).

2217129934009 is an frugal number, since it uses more digits than its factorization.

2217129934009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2978006 (or 1489003 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 49.

Multiplying 2217129934009 by its sum of digits (49), we get a square (108639366766441 = 10423021²).

The spelling of 2217129934009 in words is "two trillion, two hundred seventeen billion, one hundred twenty-nine million, nine hundred thirty-four thousand, nine".