2171211553 has 8 divisors (see below), whose sum is σ = 2499237440. Its totient is φ = 1847648880.

The previous prime is 2171211551. The next prime is 2171211557. The reversal of 2171211553 is 3551121712.

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

It is not a de Polignac number, because 2171211553 - 2¹ = 2171211551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2171211551) 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, 1114758 + ... + 1116703.

It is an arithmetic number, because the mean of its divisors is an integer number (312404680).

Almost surely, 2^2171211553 is an apocalyptic number.

It is an amenable number.

2171211553 is a deficient number, since it is larger than the sum of its proper divisors (328025887).

2171211553 is a wasteful number, since it uses less digits than its factorization.

2171211553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2231607.

The product of its digits is 2100, while the sum is 28.

The square root of 2171211553 is about 46596.2611482939. The cubic root of 2171211553 is about 1294.8934887529.

The spelling of 2171211553 in words is "two billion, one hundred seventy-one million, two hundred eleven thousand, five hundred fifty-three".