2171761472 has 56 divisors (see below), whose sum is σ = 4534220040. Its totient is φ = 1030717440.

The previous prime is 2171761469. The next prime is 2171761481. The reversal of 2171761472 is 2741671712.

It can be written as a sum of positive squares in 4 ways, for example, as 212459776 + 1959301696 = 14576^2 + 44264^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85904 + ... + 108272.

It is an arithmetic number, because the mean of its divisors is an integer number (80968215).

Almost surely, 2^2171761472 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 2171761472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2267110020).

2171761472 is an abundant number, since it is smaller than the sum of its proper divisors (2362458568).

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

2171761472 is a wasteful number, since it uses less digits than its factorization.

2171761472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22459 (or 22449 counting only the distinct ones).

The product of its digits is 32928, while the sum is 38.

The square root of 2171761472 is about 46602.1616666008. The cubic root of 2171761472 is about 1295.0028019796.

The spelling of 2171761472 in words is "two billion, one hundred seventy-one million, seven hundred sixty-one thousand, four hundred seventy-two".