2171120653 has 8 divisors (see below), whose sum is σ = 2339161496. Its totient is φ = 2003227200.

The previous prime is 2171120621. The next prime is 2171120659. The reversal of 2171120653 is 3560211712.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11009124 + 2160111529 = 3318^2 + 46477^2 .

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

It is not a de Polignac number, because 2171120653 - 2⁵ = 2171120621 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 (2171120659) 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, 5238 + ... + 66103.

It is an arithmetic number, because the mean of its divisors is an integer number (292395187).

Almost surely, 2^2171120653 is an apocalyptic number.

It is an amenable number.

2171120653 is a deficient number, since it is larger than the sum of its proper divisors (168040843).

2171120653 is a wasteful number, since it uses less digits than its factorization.

2171120653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73695.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 2171120653 is about 46595.2857379371. The cubic root of 2171120653 is about 1294.8754178190.

The spelling of 2171120653 in words is "two billion, one hundred seventy-one million, one hundred twenty thousand, six hundred fifty-three".