2171523672 has 96 divisors (see below), whose sum is σ = 6049723680. Its totient is φ = 703249920.

The previous prime is 2171523659. The next prime is 2171523703. The reversal of 2171523672 is 2763251712.

2171523672 is a `hidden beast` number, since 2 + 1 + 71 + 523 + 67 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 774978 + ... + 777774.

It is an arithmetic number, because the mean of its divisors is an integer number (63017955).

Almost surely, 2^2171523672 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2171523672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3024861840).

2171523672 is an abundant number, since it is smaller than the sum of its proper divisors (3878200008).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2171523672 is a wasteful number, since it uses less digits than its factorization.

2171523672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3113 (or 3106 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 2171523672 is about 46599.6102129621. The cubic root of 2171523672 is about 1294.9555342186.

The spelling of 2171523672 in words is "two billion, one hundred seventy-one million, five hundred twenty-three thousand, six hundred seventy-two".