2171388653 has 8 divisors (see below), whose sum is σ = 2482028160. Its totient is φ = 1860859440.

The previous prime is 2171388649. The next prime is 2171388671. The reversal of 2171388653 is 3568831712.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2171388653 - 2² = 2171388649 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2171348653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20123 + ... + 68903.

It is an arithmetic number, because the mean of its divisors is an integer number (310253520).

Almost surely, 2^2171388653 is an apocalyptic number.

It is an amenable number.

2171388653 is a deficient number, since it is larger than the sum of its proper divisors (310639507).

2171388653 is an equidigital number, since it uses as much as digits as its factorization.

2171388653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55147.

The product of its digits is 241920, while the sum is 44.

The square root of 2171388653 is about 46598.1614766076. The cubic root of 2171388653 is about 1294.9286948112.

The spelling of 2171388653 in words is "two billion, one hundred seventy-one million, three hundred eighty-eight thousand, six hundred fifty-three".