2172099447 has 24 divisors (see below), whose sum is σ = 3617431584. Its totient is φ = 1230211584.

The previous prime is 2172099443. The next prime is 2172099481. The reversal of 2172099447 is 7449902712.

It is a happy number.

It is not a de Polignac number, because 2172099447 - 2² = 2172099443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2172099443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 145438 + ... + 159675.

It is an arithmetic number, because the mean of its divisors is an integer number (150726316).

Almost surely, 2^2172099447 is an apocalyptic number.

2172099447 is a deficient number, since it is larger than the sum of its proper divisors (1445332137).

2172099447 is a wasteful number, since it uses less digits than its factorization.

2172099447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305239 (or 305236 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The square root of 2172099447 is about 46605.7876985252. The cubic root of 2172099447 is about 1295.0699756963.

The spelling of 2172099447 in words is "two billion, one hundred seventy-two million, ninety-nine thousand, four hundred forty-seven".