2171917404 has 72 divisors (see below), whose sum is σ = 5558887152. Its totient is φ = 714954240.

The previous prime is 2171917403. The next prime is 2171917411. The reversal of 2171917404 is 4047191712.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2171917403) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1345702 + ... + 1347314.

It is an arithmetic number, because the mean of its divisors is an integer number (77206766).

Almost surely, 2^2171917404 is an apocalyptic number.

It is an amenable number.

2171917404 is an abundant number, since it is smaller than the sum of its proper divisors (3386969748).

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

2171917404 is a wasteful number, since it uses less digits than its factorization.

2171917404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2067 (or 2062 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 2171917404 is about 46603.8346490930. The cubic root of 2171917404 is about 1295.0337948774.

The spelling of 2171917404 in words is "two billion, one hundred seventy-one million, nine hundred seventeen thousand, four hundred four".